content/renderer/render

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This source file includes following definitions.
GetInstance
map
ConvertInputMode
scale
offset
applied_widget_rect
original_screen_rect
original_screen_info
scale_
ChangeEmulationParams
Reapply
Apply
OnResizeMessage
OnUpdateScreenRectsMessage
OnShowContextMenu
context_menu_source_type_
Create
CreateWebWidget
Init
DoInit
CompleteInit
SetSwappedOut
UsingSynchronousRendererCompositor
EnableScreenMetricsEmulation
DisableScreenMetricsEmulation
SetPopupOriginAdjustmentsForEmulation
SetScreenMetricsEmulationParameters
SetExternalPopupOriginAdjustmentsForEmulation
OnShowHostContextMenu
ScheduleCompositeWithForcedRedraw
OnMessageReceived
Send
Resize
ResizeSynchronously
OnClose
OnCreatingNewAck
OnResize
OnChangeResizeRect
OnWasHidden
OnWasShown
OnWasSwappedOut
OnRequestMoveAck
OnUpdateRectAck
SupportsAsynchronousSwapBuffers
GetURLForGraphicsContext3D
ForceCompositingModeEnabled
CreateOutputSurface
OnSwapBuffersAborted
OnSwapBuffersPosted
OnSwapBuffersComplete
OnHandleInputEvent
OnCursorVisibilityChange
OnMouseCaptureLost
OnSetFocus
ClearFocus
PaintRect
PaintDebugBorder
AnimationCallback
AnimateIfNeeded
IsRenderingVSynced
InvalidationCallback
FlushPendingInputEventAck
DoDeferredUpdateAndSendInputAck
DoDeferredUpdate
Composite
didInvalidateRect
didScrollRect
didAutoResize
AutoResizeCompositor
didActivateCompositor
didActivateCompositor
didDeactivateCompositor
initializeLayerTreeView
layerTreeView
suppressCompositorScheduling
willBeginCompositorFrame
didBecomeReadyForAdditionalInput
DidCommitCompositorFrame
didCommitAndDrawCompositorFrame
didCompleteSwapBuffers
scheduleComposite
scheduleAnimation
didChangeCursor
show
didFocus
didBlur
DoDeferredClose
closeWidgetSoon
QueueSyntheticGesture
Close
windowRect
setToolTipText
setWindowRect
SetPendingWindowRect
rootWindowRect
windowResizerRect
OnSetInputMethodActive
OnCandidateWindowShown
OnCandidateWindowUpdated
OnCandidateWindowHidden
OnImeSetComposition
OnImeConfirmComposition
OnSnapshot
OnSnapshotHelper
OnRepaint
OnSyntheticGestureCompleted
OnSetTextDirection
OnUpdateScreenRects
OnShowImeIfNeeded
IncrementOutstandingImeEventAcks
OnImeEventAck
ShouldHandleImeEvent
SetDeviceScaleFactor
GetBitmapForOptimizedPluginPaint
GetScrollOffset
SetHidden
WillToggleFullscreen
DidToggleFullscreen
SetBackground
next_paint_is_resize_ack
next_paint_is_restore_ack
set_next_paint_is_resize_ack
set_next_paint_is_restore_ack
set_next_paint_is_repaint_ack
IsDateTimeInput
StartHandlingImeEvent
FinishHandlingImeEvent
UpdateTextInputType
UpdateTextInputState
GetSelectionBounds
UpdateSelectionBounds
WebKitToUiTextInputType
GetTextInputType
UpdateCompositionInfo
GetCompositionCharacterBounds
GetCompositionRange
ShouldUpdateCompositionInfo
CanComposeInline
screenInfo
deviceScaleFactor
resetInputMethod
didHandleGestureEvent
SchedulePluginMove
CleanupWindowInPluginMoves
compositor
WillHandleMouseEvent
WillHandleGestureEvent
hasTouchEventHandlers
setTouchAction
UpdateSelectionRootBounds
HasTouchEventHandlersAt
CreateGraphicsContext3D
RegisterSwappedOutChildFrame
UnregisterSwappedOutChildFrame
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/renderer/render_widget.h"

#include "base/bind.h"
#include "base/command_line.h"
#include "base/debug/trace_event.h"
#include "base/debug/trace_event_synthetic_delay.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/histogram.h"
#include "base/stl_util.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
#include "cc/base/switches.h"
#include "cc/debug/benchmark_instrumentation.h"
#include "cc/output/output_surface.h"
#include "cc/trees/layer_tree_host.h"
#include "content/child/npapi/webplugin.h"
#include "content/common/gpu/client/context_provider_command_buffer.h"
#include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
#include "content/common/gpu/gpu_process_launch_causes.h"
#include "content/common/input/synthetic_gesture_packet.h"
#include "content/common/input/web_input_event_traits.h"
#include "content/common/input_messages.h"
#include "content/common/swapped_out_messages.h"
#include "content/common/view_messages.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/context_menu_params.h"
#include "content/renderer/cursor_utils.h"
#include "content/renderer/external_popup_menu.h"
#include "content/renderer/gpu/compositor_output_surface.h"
#include "content/renderer/gpu/compositor_software_output_device.h"
#include "content/renderer/gpu/delegated_compositor_output_surface.h"
#include "content/renderer/gpu/mailbox_output_surface.h"
#include "content/renderer/gpu/render_widget_compositor.h"
#include "content/renderer/ime_event_guard.h"
#include "content/renderer/input/input_handler_manager.h"
#include "content/renderer/pepper/pepper_plugin_instance_impl.h"
#include "content/renderer/render_frame_impl.h"
#include "content/renderer/render_process.h"
#include "content/renderer/render_thread_impl.h"
#include "content/renderer/renderer_webkitplatformsupport_impl.h"
#include "content/renderer/resizing_mode_selector.h"
#include "ipc/ipc_sync_message.h"
#include "skia/ext/platform_canvas.h"
#include "third_party/WebKit/public/platform/WebCursorInfo.h"
#include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
#include "third_party/WebKit/public/platform/WebRect.h"
#include "third_party/WebKit/public/platform/WebScreenInfo.h"
#include "third_party/WebKit/public/platform/WebSize.h"
#include "third_party/WebKit/public/platform/WebString.h"
#include "third_party/WebKit/public/web/WebDeviceEmulationParams.h"
#include "third_party/WebKit/public/web/WebPagePopup.h"
#include "third_party/WebKit/public/web/WebPopupMenu.h"
#include "third_party/WebKit/public/web/WebPopupMenuInfo.h"
#include "third_party/WebKit/public/web/WebRange.h"
#include "third_party/skia/include/core/SkShader.h"
#include "ui/base/ui_base_switches.h"
#include "ui/gfx/frame_time.h"
#include "ui/gfx/point_conversions.h"
#include "ui/gfx/rect_conversions.h"
#include "ui/gfx/size_conversions.h"
#include "ui/gfx/skia_util.h"
#include "ui/gl/gl_switches.h"
#include "ui/surface/transport_dib.h"

#if defined(OS_ANDROID)
#include <android/keycodes.h>
#include "base/android/sys_utils.h"
#include "content/renderer/android/synchronous_compositor_factory.h"
#endif

#if defined(OS_POSIX)
#include "ipc/ipc_channel_posix.h"
#include "third_party/skia/include/core/SkMallocPixelRef.h"
#include "third_party/skia/include/core/SkPixelRef.h"
#endif  // defined(OS_POSIX)

#include "third_party/WebKit/public/web/WebWidget.h"

using blink::WebCompositionUnderline;
using blink::WebCursorInfo;
using blink::WebDeviceEmulationParams;
using blink::WebGestureEvent;
using blink::WebInputEvent;
using blink::WebKeyboardEvent;
using blink::WebMouseEvent;
using blink::WebMouseWheelEvent;
using blink::WebNavigationPolicy;
using blink::WebPagePopup;
using blink::WebPopupMenu;
using blink::WebPopupMenuInfo;
using blink::WebPopupType;
using blink::WebRange;
using blink::WebRect;
using blink::WebScreenInfo;
using blink::WebSize;
using blink::WebTextDirection;
using blink::WebTouchEvent;
using blink::WebTouchPoint;
using blink::WebVector;
using blink::WebWidget;

namespace {

typedef std::map<std::string, ui::TextInputMode> TextInputModeMap;

class TextInputModeMapSingleton {
 public:
  static TextInputModeMapSingleton* GetInstance() {
    return Singleton<TextInputModeMapSingleton>::get();
  }
  TextInputModeMapSingleton() {
    map_["verbatim"] = ui::TEXT_INPUT_MODE_VERBATIM;
    map_["latin"] = ui::TEXT_INPUT_MODE_LATIN;
    map_["latin-name"] = ui::TEXT_INPUT_MODE_LATIN_NAME;
    map_["latin-prose"] = ui::TEXT_INPUT_MODE_LATIN_PROSE;
    map_["full-width-latin"] = ui::TEXT_INPUT_MODE_FULL_WIDTH_LATIN;
    map_["kana"] = ui::TEXT_INPUT_MODE_KANA;
    map_["katakana"] = ui::TEXT_INPUT_MODE_KATAKANA;
    map_["numeric"] = ui::TEXT_INPUT_MODE_NUMERIC;
    map_["tel"] = ui::TEXT_INPUT_MODE_TEL;
    map_["email"] = ui::TEXT_INPUT_MODE_EMAIL;
    map_["url"] = ui::TEXT_INPUT_MODE_URL;
  }
  const TextInputModeMap& map() const { return map_; }
 private:
  TextInputModeMap map_;

  friend struct DefaultSingletonTraits<TextInputModeMapSingleton>;

  DISALLOW_COPY_AND_ASSIGN(TextInputModeMapSingleton);
};

ui::TextInputMode ConvertInputMode(const blink::WebString& input_mode) {
  static TextInputModeMapSingleton* singleton =
      TextInputModeMapSingleton::GetInstance();
  TextInputModeMap::const_iterator it =
      singleton->map().find(input_mode.utf8());
  if (it == singleton->map().end())
    return ui::TEXT_INPUT_MODE_DEFAULT;
  return it->second;
}

// TODO(brianderson): Replace the hard-coded threshold with a fraction of
// the BeginMainFrame interval.
// 4166us will allow 1/4 of a 60Hz interval or 1/2 of a 120Hz interval to
// be spent in input hanlders before input starts getting throttled.
const int kInputHandlingTimeThrottlingThresholdMicroseconds = 4166;

}  // namespace

namespace content {

// RenderWidget::ScreenMetricsEmulator ----------------------------------------

class RenderWidget::ScreenMetricsEmulator {
 public:
  ScreenMetricsEmulator(
      RenderWidget* widget,
      const WebDeviceEmulationParams& params);
  virtual ~ScreenMetricsEmulator();

  // Scale and offset used to convert between host coordinates
  // and webwidget coordinates.
  float scale() { return scale_; }
  gfx::Point offset() { return offset_; }
  gfx::Rect applied_widget_rect() const { return applied_widget_rect_; }
  gfx::Rect original_screen_rect() const { return original_view_screen_rect_; }
  const WebScreenInfo& original_screen_info() { return original_screen_info_; }

  void ChangeEmulationParams(
      const WebDeviceEmulationParams& params);

  // The following methods alter handlers' behavior for messages related to
  // widget size and position.
  void OnResizeMessage(const ViewMsg_Resize_Params& params);
  void OnUpdateScreenRectsMessage(const gfx::Rect& view_screen_rect,
                                  const gfx::Rect& window_screen_rect);
  void OnShowContextMenu(ContextMenuParams* params);

 private:
  void Reapply();
  void Apply(float overdraw_bottom_height,
      gfx::Rect resizer_rect, bool is_fullscreen);

  RenderWidget* widget_;

  // Parameters as passed by RenderWidget::EnableScreenMetricsEmulation.
  WebDeviceEmulationParams params_;

  // The computed scale and offset used to fit widget into browser window.
  float scale_;
  gfx::Point offset_;

  // Widget rect as passed to webwidget.
  gfx::Rect applied_widget_rect_;

  // Original values to restore back after emulation ends.
  gfx::Size original_size_;
  gfx::Size original_physical_backing_size_;
  blink::WebScreenInfo original_screen_info_;
  gfx::Rect original_view_screen_rect_;
  gfx::Rect original_window_screen_rect_;
};

RenderWidget::ScreenMetricsEmulator::ScreenMetricsEmulator(
    RenderWidget* widget,
    const WebDeviceEmulationParams& params)
    : widget_(widget),
      params_(params),
      scale_(1.f) {
  original_size_ = widget_->size_;
  original_physical_backing_size_ = widget_->physical_backing_size_;
  original_screen_info_ = widget_->screen_info_;
  original_view_screen_rect_ = widget_->view_screen_rect_;
  original_window_screen_rect_ = widget_->window_screen_rect_;
  Apply(widget_->overdraw_bottom_height_,
        widget_->resizer_rect_, widget_->is_fullscreen_);
}

RenderWidget::ScreenMetricsEmulator::~ScreenMetricsEmulator() {
  widget_->screen_info_ = original_screen_info_;

  widget_->SetDeviceScaleFactor(original_screen_info_.deviceScaleFactor);
  widget_->SetScreenMetricsEmulationParameters(0.f, gfx::Point(), 1.f);
  widget_->view_screen_rect_ = original_view_screen_rect_;
  widget_->window_screen_rect_ = original_window_screen_rect_;
  widget_->Resize(original_size_, original_physical_backing_size_,
      widget_->overdraw_bottom_height_, widget_->resizer_rect_,
      widget_->is_fullscreen_, NO_RESIZE_ACK);
}

void RenderWidget::ScreenMetricsEmulator::ChangeEmulationParams(
    const WebDeviceEmulationParams& params) {
  params_ = params;
  Reapply();
}

void RenderWidget::ScreenMetricsEmulator::Reapply() {
  Apply(widget_->overdraw_bottom_height_,
        widget_->resizer_rect_, widget_->is_fullscreen_);
}

void RenderWidget::ScreenMetricsEmulator::Apply(
    float overdraw_bottom_height, gfx::Rect resizer_rect, bool is_fullscreen) {
  applied_widget_rect_.set_size(params_.viewSize.isEmpty() ?
      original_size_ : gfx::Size(params_.viewSize));

  if (params_.fitToView) {
    DCHECK(!original_size_.IsEmpty());

    int width_with_gutter =
        std::max(original_size_.width() - 2 * params_.viewInsets.width, 1);
    int height_with_gutter =
        std::max(original_size_.height() - 2 * params_.viewInsets.height, 1);
    float width_ratio =
        static_cast<float>(applied_widget_rect_.width()) / width_with_gutter;
    float height_ratio =
        static_cast<float>(applied_widget_rect_.height()) / height_with_gutter;
    float ratio = std::max(1.0f, std::max(width_ratio, height_ratio));
    scale_ = 1.f / ratio;

    // Center emulated view inside available view space.
    offset_.set_x(
        (original_size_.width() - scale_ * applied_widget_rect_.width()) / 2);
    offset_.set_y(
        (original_size_.height() - scale_ * applied_widget_rect_.height()) / 2);
  } else {
    scale_ = 1.f;
    offset_.SetPoint(0, 0);
  }

  if (params_.screenPosition == WebDeviceEmulationParams::Desktop) {
    applied_widget_rect_.set_origin(original_view_screen_rect_.origin());
    widget_->screen_info_.rect = original_screen_info_.rect;
    widget_->screen_info_.availableRect = original_screen_info_.availableRect;
    widget_->window_screen_rect_ = original_window_screen_rect_;
  } else {
    applied_widget_rect_.set_origin(gfx::Point(0, 0));
    widget_->screen_info_.rect = applied_widget_rect_;
    widget_->screen_info_.availableRect = applied_widget_rect_;
    widget_->window_screen_rect_ = applied_widget_rect_;
  }

  float applied_device_scale_factor = params_.deviceScaleFactor ?
      params_.deviceScaleFactor : original_screen_info_.deviceScaleFactor;
  widget_->screen_info_.deviceScaleFactor = applied_device_scale_factor;

  // Pass three emulation parameters to the blink side:
  // - we keep the real device scale factor in compositor to produce sharp image
  //   even when emulating different scale factor;
  // - in order to fit into view, WebView applies offset and scale to the
  //   root layer.
  widget_->SetScreenMetricsEmulationParameters(
      original_screen_info_.deviceScaleFactor, offset_, scale_);

  widget_->SetDeviceScaleFactor(applied_device_scale_factor);
  widget_->view_screen_rect_ = applied_widget_rect_;

  gfx::Size physical_backing_size = gfx::ToCeiledSize(gfx::ScaleSize(
      original_size_, original_screen_info_.deviceScaleFactor));
  widget_->Resize(applied_widget_rect_.size(), physical_backing_size,
      overdraw_bottom_height, resizer_rect, is_fullscreen, NO_RESIZE_ACK);
}

void RenderWidget::ScreenMetricsEmulator::OnResizeMessage(
    const ViewMsg_Resize_Params& params) {
  bool need_ack = params.new_size != original_size_ &&
      !params.new_size.IsEmpty() && !params.physical_backing_size.IsEmpty();
  original_size_ = params.new_size;
  original_physical_backing_size_ = params.physical_backing_size;
  original_screen_info_ = params.screen_info;
  Apply(params.overdraw_bottom_height, params.resizer_rect,
        params.is_fullscreen);

  if (need_ack) {
    widget_->set_next_paint_is_resize_ack();
    if (widget_->compositor_)
      widget_->compositor_->SetNeedsRedrawRect(gfx::Rect(widget_->size_));
  }
}

void RenderWidget::ScreenMetricsEmulator::OnUpdateScreenRectsMessage(
    const gfx::Rect& view_screen_rect,
    const gfx::Rect& window_screen_rect) {
  original_view_screen_rect_ = view_screen_rect;
  original_window_screen_rect_ = window_screen_rect;
  if (params_.screenPosition == WebDeviceEmulationParams::Desktop)
    Reapply();
}

void RenderWidget::ScreenMetricsEmulator::OnShowContextMenu(
    ContextMenuParams* params) {
  params->x *= scale_;
  params->x += offset_.x();
  params->y *= scale_;
  params->y += offset_.y();
}

// RenderWidget ---------------------------------------------------------------

RenderWidget::RenderWidget(blink::WebPopupType popup_type,
                           const blink::WebScreenInfo& screen_info,
                           bool swapped_out,
                           bool hidden)
    : routing_id_(MSG_ROUTING_NONE),
      surface_id_(0),
      webwidget_(NULL),
      opener_id_(MSG_ROUTING_NONE),
      init_complete_(false),
      current_paint_buf_(NULL),
      overdraw_bottom_height_(0.f),
      next_paint_flags_(0),
      filtered_time_per_frame_(0.0f),
      update_reply_pending_(false),
      auto_resize_mode_(false),
      need_update_rect_for_auto_resize_(false),
      using_asynchronous_swapbuffers_(false),
      num_swapbuffers_complete_pending_(0),
      did_show_(false),
      is_hidden_(hidden),
      is_fullscreen_(false),
      needs_repainting_on_restore_(false),
      has_focus_(false),
      handling_input_event_(false),
      handling_ime_event_(false),
      handling_touchstart_event_(false),
      closing_(false),
      is_swapped_out_(swapped_out),
      input_method_is_active_(false),
      text_input_type_(ui::TEXT_INPUT_TYPE_NONE),
      text_input_mode_(ui::TEXT_INPUT_MODE_DEFAULT),
      can_compose_inline_(true),
      popup_type_(popup_type),
      pending_window_rect_count_(0),
      suppress_next_char_events_(false),
      is_accelerated_compositing_active_(false),
      was_accelerated_compositing_ever_active_(false),
      animation_update_pending_(false),
      invalidation_task_posted_(false),
      screen_info_(screen_info),
      device_scale_factor_(screen_info_.deviceScaleFactor),
      is_threaded_compositing_enabled_(false),
      next_output_surface_id_(0),
#if defined(OS_ANDROID)
      outstanding_ime_acks_(0),
#endif
      popup_origin_scale_for_emulation_(0.f),
      resizing_mode_selector_(new ResizingModeSelector()),
      context_menu_source_type_(ui::MENU_SOURCE_MOUSE) {
  if (!swapped_out)
    RenderProcess::current()->AddRefProcess();
  DCHECK(RenderThread::Get());
  has_disable_gpu_vsync_switch_ = CommandLine::ForCurrentProcess()->HasSwitch(
      switches::kDisableGpuVsync);
  is_threaded_compositing_enabled_ =
      CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kEnableThreadedCompositing);

  legacy_software_mode_stats_ = cc::RenderingStatsInstrumentation::Create();
  if (CommandLine::ForCurrentProcess()->HasSwitch(
          cc::switches::kEnableGpuBenchmarking))
    legacy_software_mode_stats_->set_record_rendering_stats(true);
}

RenderWidget::~RenderWidget() {
  DCHECK(!webwidget_) << "Leaking our WebWidget!";
  STLDeleteElements(&updates_pending_swap_);
  if (current_paint_buf_) {
    if (RenderProcess::current()) {
      // If the RenderProcess is already gone, it will have released all DIBs
      // in its destructor anyway.
      RenderProcess::current()->ReleaseTransportDIB(current_paint_buf_);
    }
    current_paint_buf_ = NULL;
  }

  // If we are swapped out, we have released already.
  if (!is_swapped_out_ && RenderProcess::current())
    RenderProcess::current()->ReleaseProcess();
}

// static
RenderWidget* RenderWidget::Create(int32 opener_id,
                                   blink::WebPopupType popup_type,
                                   const blink::WebScreenInfo& screen_info) {
  DCHECK(opener_id != MSG_ROUTING_NONE);
  scoped_refptr<RenderWidget> widget(
      new RenderWidget(popup_type, screen_info, false, false));
  if (widget->Init(opener_id)) {  // adds reference on success.
    return widget.get();
  }
  return NULL;
}

// static
WebWidget* RenderWidget::CreateWebWidget(RenderWidget* render_widget) {
  switch (render_widget->popup_type_) {
    case blink::WebPopupTypeNone:  // Nothing to create.
      break;
    case blink::WebPopupTypeSelect:
    case blink::WebPopupTypeSuggestion:
      return WebPopupMenu::create(render_widget);
    case blink::WebPopupTypePage:
      return WebPagePopup::create(render_widget);
    default:
      NOTREACHED();
  }
  return NULL;
}

bool RenderWidget::Init(int32 opener_id) {
  return DoInit(opener_id,
                RenderWidget::CreateWebWidget(this),
                new ViewHostMsg_CreateWidget(opener_id, popup_type_,
                                             &routing_id_, &surface_id_));
}

bool RenderWidget::DoInit(int32 opener_id,
                          WebWidget* web_widget,
                          IPC::SyncMessage* create_widget_message) {
  DCHECK(!webwidget_);

  if (opener_id != MSG_ROUTING_NONE)
    opener_id_ = opener_id;

  webwidget_ = web_widget;

  bool result = RenderThread::Get()->Send(create_widget_message);
  if (result) {
    RenderThread::Get()->AddRoute(routing_id_, this);
    // Take a reference on behalf of the RenderThread.  This will be balanced
    // when we receive ViewMsg_Close.
    AddRef();
    if (RenderThreadImpl::current()) {
      RenderThreadImpl::current()->WidgetCreated();
      if (is_hidden_)
        RenderThreadImpl::current()->WidgetHidden();
    }
    return true;
  } else {
    // The above Send can fail when the tab is closing.
    return false;
  }
}

// This is used to complete pending inits and non-pending inits.
void RenderWidget::CompleteInit() {
  DCHECK(routing_id_ != MSG_ROUTING_NONE);

  init_complete_ = true;

  if (webwidget_ && is_threaded_compositing_enabled_) {
    webwidget_->enterForceCompositingMode(true);
  }
  if (compositor_) {
    compositor_->setSurfaceReady();
  }
  DoDeferredUpdate();

  Send(new ViewHostMsg_RenderViewReady(routing_id_));
}

void RenderWidget::SetSwappedOut(bool is_swapped_out) {
  // We should only toggle between states.
  DCHECK(is_swapped_out_ != is_swapped_out);
  is_swapped_out_ = is_swapped_out;

  // If we are swapping out, we will call ReleaseProcess, allowing the process
  // to exit if all of its RenderViews are swapped out.  We wait until the
  // WasSwappedOut call to do this, to avoid showing the sad tab.
  // If we are swapping in, we call AddRefProcess to prevent the process from
  // exiting.
  if (!is_swapped_out)
    RenderProcess::current()->AddRefProcess();
}

bool RenderWidget::UsingSynchronousRendererCompositor() const {
#if defined(OS_ANDROID)
  return SynchronousCompositorFactory::GetInstance() != NULL;
#else
  return false;
#endif
}

void RenderWidget::EnableScreenMetricsEmulation(
    const WebDeviceEmulationParams& params) {
  if (!screen_metrics_emulator_)
    screen_metrics_emulator_.reset(new ScreenMetricsEmulator(this, params));
  else
    screen_metrics_emulator_->ChangeEmulationParams(params);
}

void RenderWidget::DisableScreenMetricsEmulation() {
  screen_metrics_emulator_.reset();
}

void RenderWidget::SetPopupOriginAdjustmentsForEmulation(
    ScreenMetricsEmulator* emulator) {
  popup_origin_scale_for_emulation_ = emulator->scale();
  popup_view_origin_for_emulation_ = emulator->applied_widget_rect().origin();
  popup_screen_origin_for_emulation_ = gfx::Point(
      emulator->original_screen_rect().origin().x() + emulator->offset().x(),
      emulator->original_screen_rect().origin().y() + emulator->offset().y());
  screen_info_ = emulator->original_screen_info();
  device_scale_factor_ = screen_info_.deviceScaleFactor;
}

void RenderWidget::SetScreenMetricsEmulationParameters(
    float device_scale_factor,
    const gfx::Point& root_layer_offset,
    float root_layer_scale) {
  // This is only supported in RenderView.
  NOTREACHED();
}

#if defined(OS_MACOSX) || defined(OS_ANDROID)
void RenderWidget::SetExternalPopupOriginAdjustmentsForEmulation(
    ExternalPopupMenu* popup, ScreenMetricsEmulator* emulator) {
  popup->SetOriginScaleAndOffsetForEmulation(
      emulator->scale(), emulator->offset());
}
#endif

void RenderWidget::OnShowHostContextMenu(ContextMenuParams* params) {
  if (screen_metrics_emulator_)
    screen_metrics_emulator_->OnShowContextMenu(params);
}

void RenderWidget::ScheduleCompositeWithForcedRedraw() {
  if (compositor_) {
    // Regardless of whether threaded compositing is enabled, always
    // use this mechanism to force the compositor to redraw. However,
    // the invalidation code path below is still needed for the
    // non-threaded case.
    compositor_->SetNeedsForcedRedraw();
  }
  scheduleComposite();
}

bool RenderWidget::OnMessageReceived(const IPC::Message& message) {
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP(RenderWidget, message)
    IPC_MESSAGE_HANDLER(InputMsg_HandleInputEvent, OnHandleInputEvent)
    IPC_MESSAGE_HANDLER(InputMsg_CursorVisibilityChange,
                        OnCursorVisibilityChange)
    IPC_MESSAGE_HANDLER(InputMsg_MouseCaptureLost, OnMouseCaptureLost)
    IPC_MESSAGE_HANDLER(InputMsg_SetFocus, OnSetFocus)
    IPC_MESSAGE_HANDLER(InputMsg_SyntheticGestureCompleted,
                        OnSyntheticGestureCompleted)
    IPC_MESSAGE_HANDLER(ViewMsg_Close, OnClose)
    IPC_MESSAGE_HANDLER(ViewMsg_CreatingNew_ACK, OnCreatingNewAck)
    IPC_MESSAGE_HANDLER(ViewMsg_Resize, OnResize)
    IPC_MESSAGE_HANDLER(ViewMsg_ChangeResizeRect, OnChangeResizeRect)
    IPC_MESSAGE_HANDLER(ViewMsg_WasHidden, OnWasHidden)
    IPC_MESSAGE_HANDLER(ViewMsg_WasShown, OnWasShown)
    IPC_MESSAGE_HANDLER(ViewMsg_WasSwappedOut, OnWasSwappedOut)
    IPC_MESSAGE_HANDLER(ViewMsg_UpdateRect_ACK, OnUpdateRectAck)
    IPC_MESSAGE_HANDLER(ViewMsg_SwapBuffers_ACK, OnSwapBuffersComplete)
    IPC_MESSAGE_HANDLER(ViewMsg_SetInputMethodActive, OnSetInputMethodActive)
    IPC_MESSAGE_HANDLER(ViewMsg_CandidateWindowShown, OnCandidateWindowShown)
    IPC_MESSAGE_HANDLER(ViewMsg_CandidateWindowUpdated,
                        OnCandidateWindowUpdated)
    IPC_MESSAGE_HANDLER(ViewMsg_CandidateWindowHidden, OnCandidateWindowHidden)
    IPC_MESSAGE_HANDLER(ViewMsg_ImeSetComposition, OnImeSetComposition)
    IPC_MESSAGE_HANDLER(ViewMsg_ImeConfirmComposition, OnImeConfirmComposition)
    IPC_MESSAGE_HANDLER(ViewMsg_Repaint, OnRepaint)
    IPC_MESSAGE_HANDLER(ViewMsg_SetTextDirection, OnSetTextDirection)
    IPC_MESSAGE_HANDLER(ViewMsg_Move_ACK, OnRequestMoveAck)
    IPC_MESSAGE_HANDLER(ViewMsg_UpdateScreenRects, OnUpdateScreenRects)
#if defined(OS_ANDROID)
    IPC_MESSAGE_HANDLER(ViewMsg_ShowImeIfNeeded, OnShowImeIfNeeded)
    IPC_MESSAGE_HANDLER(ViewMsg_ImeEventAck, OnImeEventAck)
#endif
    IPC_MESSAGE_HANDLER(ViewMsg_Snapshot, OnSnapshot)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()
  return handled;
}

bool RenderWidget::Send(IPC::Message* message) {
  // Don't send any messages after the browser has told us to close, and filter
  // most outgoing messages while swapped out.
  if ((is_swapped_out_ &&
       !SwappedOutMessages::CanSendWhileSwappedOut(message)) ||
      closing_) {
    delete message;
    return false;
  }

  // If given a messsage without a routing ID, then assign our routing ID.
  if (message->routing_id() == MSG_ROUTING_NONE)
    message->set_routing_id(routing_id_);

  return RenderThread::Get()->Send(message);
}

void RenderWidget::Resize(const gfx::Size& new_size,
                          const gfx::Size& physical_backing_size,
                          float overdraw_bottom_height,
                          const gfx::Rect& resizer_rect,
                          bool is_fullscreen,
                          ResizeAck resize_ack) {
  if (resizing_mode_selector_->NeverUsesSynchronousResize()) {
    // A resize ack shouldn't be requested if we have not ACK'd the previous
    // one.
    DCHECK(resize_ack != SEND_RESIZE_ACK || !next_paint_is_resize_ack());
    DCHECK(resize_ack == SEND_RESIZE_ACK || resize_ack == NO_RESIZE_ACK);
  }

  // Ignore this during shutdown.
  if (!webwidget_)
    return;

  if (compositor_) {
    compositor_->setViewportSize(new_size, physical_backing_size);
    compositor_->SetOverdrawBottomHeight(overdraw_bottom_height);
  }

  physical_backing_size_ = physical_backing_size;
  overdraw_bottom_height_ = overdraw_bottom_height;
  resizer_rect_ = resizer_rect;

  // NOTE: We may have entered fullscreen mode without changing our size.
  bool fullscreen_change = is_fullscreen_ != is_fullscreen;
  if (fullscreen_change)
    WillToggleFullscreen();
  is_fullscreen_ = is_fullscreen;

  if (size_ != new_size) {
    // TODO(darin): We should not need to reset this here.
    needs_repainting_on_restore_ = false;

    size_ = new_size;

    paint_aggregator_.ClearPendingUpdate();

    // When resizing, we want to wait to paint before ACK'ing the resize.  This
    // ensures that we only resize as fast as we can paint.  We only need to
    // send an ACK if we are resized to a non-empty rect.
    webwidget_->resize(new_size);

    if (resizing_mode_selector_->NeverUsesSynchronousResize()) {
      // Resize should have caused an invalidation of the entire view.
      DCHECK(new_size.IsEmpty() || is_accelerated_compositing_active_ ||
             paint_aggregator_.HasPendingUpdate());
    }
  } else if (!resizing_mode_selector_->is_synchronous_mode()) {
    resize_ack = NO_RESIZE_ACK;
  }

  if (new_size.IsEmpty() || physical_backing_size.IsEmpty()) {
    // For empty size or empty physical_backing_size, there is no next paint
    // (along with which to send the ack) until they are set to non-empty.
    resize_ack = NO_RESIZE_ACK;
  }

  // Send the Resize_ACK flag once we paint again if requested.
  if (resize_ack == SEND_RESIZE_ACK)
    set_next_paint_is_resize_ack();

  if (fullscreen_change)
    DidToggleFullscreen();

  // If a resize ack is requested and it isn't set-up, then no more resizes will
  // come in and in general things will go wrong.
  DCHECK(resize_ack != SEND_RESIZE_ACK || next_paint_is_resize_ack());
}

void RenderWidget::ResizeSynchronously(const gfx::Rect& new_position) {
  Resize(new_position.size(), new_position.size(), overdraw_bottom_height_,
         gfx::Rect(), is_fullscreen_, NO_RESIZE_ACK);
  view_screen_rect_ = new_position;
  window_screen_rect_ = new_position;
  if (!did_show_)
    initial_pos_ = new_position;
}

void RenderWidget::OnClose() {
  if (closing_)
    return;
  closing_ = true;

  // Browser correspondence is no longer needed at this point.
  if (routing_id_ != MSG_ROUTING_NONE) {
    if (RenderThreadImpl::current())
      RenderThreadImpl::current()->WidgetDestroyed();
    RenderThread::Get()->RemoveRoute(routing_id_);
    SetHidden(false);
  }

  // If there is a Send call on the stack, then it could be dangerous to close
  // now.  Post a task that only gets invoked when there are no nested message
  // loops.
  base::MessageLoop::current()->PostNonNestableTask(
      FROM_HERE, base::Bind(&RenderWidget::Close, this));

  // Balances the AddRef taken when we called AddRoute.
  Release();
}

// Got a response from the browser after the renderer decided to create a new
// view.
void RenderWidget::OnCreatingNewAck() {
  DCHECK(routing_id_ != MSG_ROUTING_NONE);

  CompleteInit();
}

void RenderWidget::OnResize(const ViewMsg_Resize_Params& params) {
  if (resizing_mode_selector_->ShouldAbortOnResize(this, params))
    return;

  if (screen_metrics_emulator_) {
    screen_metrics_emulator_->OnResizeMessage(params);
    return;
  }

  screen_info_ = params.screen_info;
  SetDeviceScaleFactor(screen_info_.deviceScaleFactor);
  Resize(params.new_size, params.physical_backing_size,
         params.overdraw_bottom_height, params.resizer_rect,
         params.is_fullscreen, SEND_RESIZE_ACK);
}

void RenderWidget::OnChangeResizeRect(const gfx::Rect& resizer_rect) {
  if (resizer_rect_ != resizer_rect) {
    gfx::Rect view_rect(size_);

    gfx::Rect old_damage_rect = gfx::IntersectRects(view_rect, resizer_rect_);
    if (!old_damage_rect.IsEmpty())
      paint_aggregator_.InvalidateRect(old_damage_rect);

    gfx::Rect new_damage_rect = gfx::IntersectRects(view_rect, resizer_rect);
    if (!new_damage_rect.IsEmpty())
      paint_aggregator_.InvalidateRect(new_damage_rect);

    resizer_rect_ = resizer_rect;

    if (webwidget_)
      webwidget_->didChangeWindowResizerRect();
  }
}

void RenderWidget::OnWasHidden() {
  TRACE_EVENT0("renderer", "RenderWidget::OnWasHidden");
  // Go into a mode where we stop generating paint and scrolling events.
  SetHidden(true);
}

void RenderWidget::OnWasShown(bool needs_repainting) {
  TRACE_EVENT0("renderer", "RenderWidget::OnWasShown");
  // During shutdown we can just ignore this message.
  if (!webwidget_)
    return;

  // See OnWasHidden
  SetHidden(false);

  if (!needs_repainting && !needs_repainting_on_restore_)
    return;
  needs_repainting_on_restore_ = false;

  // Tag the next paint as a restore ack, which is picked up by
  // DoDeferredUpdate when it sends out the next PaintRect message.
  set_next_paint_is_restore_ack();

  // Generate a full repaint.
  if (!is_accelerated_compositing_active_) {
    didInvalidateRect(gfx::Rect(size_.width(), size_.height()));
  } else {
    if (compositor_)
      compositor_->SetNeedsForcedRedraw();
    scheduleComposite();
  }
}

void RenderWidget::OnWasSwappedOut() {
  // If we have been swapped out and no one else is using this process,
  // it's safe to exit now.  If we get swapped back in, we will call
  // AddRefProcess in SetSwappedOut.
  if (is_swapped_out_)
    RenderProcess::current()->ReleaseProcess();
}

void RenderWidget::OnRequestMoveAck() {
  DCHECK(pending_window_rect_count_);
  pending_window_rect_count_--;
}

void RenderWidget::OnUpdateRectAck() {
  TRACE_EVENT0("renderer", "RenderWidget::OnUpdateRectAck");
  DCHECK(update_reply_pending_);
  update_reply_pending_ = false;

  // If we sent an UpdateRect message with a zero-sized bitmap, then we should
  // have no current paint buffer.
  if (current_paint_buf_) {
    RenderProcess::current()->ReleaseTransportDIB(current_paint_buf_);
    current_paint_buf_ = NULL;
  }

  // If swapbuffers is still pending, then defer the update until the
  // swapbuffers occurs.
  if (num_swapbuffers_complete_pending_ >= kMaxSwapBuffersPending) {
    TRACE_EVENT0("renderer", "EarlyOut_SwapStillPending");
    return;
  }

  // Notify subclasses that software rendering was flushed to the screen.
  if (!is_accelerated_compositing_active_) {
    DidFlushPaint();
  }

  // Continue painting if necessary...
  DoDeferredUpdateAndSendInputAck();
}

bool RenderWidget::SupportsAsynchronousSwapBuffers() {
  // Contexts using the command buffer support asynchronous swapbuffers.
  // See RenderWidget::CreateOutputSurface().
  if (RenderThreadImpl::current()->compositor_message_loop_proxy().get())
    return false;

  return true;
}

GURL RenderWidget::GetURLForGraphicsContext3D() {
  return GURL();
}

bool RenderWidget::ForceCompositingModeEnabled() {
  return false;
}

scoped_ptr<cc::OutputSurface> RenderWidget::CreateOutputSurface(bool fallback) {

#if defined(OS_ANDROID)
  if (SynchronousCompositorFactory* factory =
      SynchronousCompositorFactory::GetInstance()) {
    return factory->CreateOutputSurface(routing_id());
  }
#endif

  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
  bool use_software = fallback;
  if (command_line.HasSwitch(switches::kDisableGpuCompositing))
    use_software = true;

  scoped_refptr<ContextProviderCommandBuffer> context_provider;
  if (!use_software) {
    context_provider = ContextProviderCommandBuffer::Create(
        CreateGraphicsContext3D(), "RenderCompositor");
    if (!context_provider.get()) {
      // Cause the compositor to wait and try again.
      return scoped_ptr<cc::OutputSurface>();
    }
  }

  uint32 output_surface_id = next_output_surface_id_++;
  if (command_line.HasSwitch(switches::kEnableDelegatedRenderer)) {
    DCHECK(is_threaded_compositing_enabled_);
    return scoped_ptr<cc::OutputSurface>(
        new DelegatedCompositorOutputSurface(
            routing_id(),
            output_surface_id,
            context_provider));
  }
  if (!context_provider.get()) {
    if (!command_line.HasSwitch(switches::kEnableSoftwareCompositing))
      return scoped_ptr<cc::OutputSurface>();

    scoped_ptr<cc::SoftwareOutputDevice> software_device(
        new CompositorSoftwareOutputDevice());

    return scoped_ptr<cc::OutputSurface>(new CompositorOutputSurface(
        routing_id(),
        output_surface_id,
        NULL,
        software_device.Pass(),
        true));
  }

  if (command_line.HasSwitch(cc::switches::kCompositeToMailbox)) {
    DCHECK(is_threaded_compositing_enabled_);
    cc::ResourceFormat format = cc::RGBA_8888;
#if defined(OS_ANDROID)
    if (base::android::SysUtils::IsLowEndDevice())
      format = cc::RGB_565;
#endif
    return scoped_ptr<cc::OutputSurface>(
        new MailboxOutputSurface(
            routing_id(),
            output_surface_id,
            context_provider,
            scoped_ptr<cc::SoftwareOutputDevice>(),
            format));
  }
  bool use_swap_compositor_frame_message = false;
  return scoped_ptr<cc::OutputSurface>(
      new CompositorOutputSurface(
          routing_id(),
          output_surface_id,
          context_provider,
          scoped_ptr<cc::SoftwareOutputDevice>(),
          use_swap_compositor_frame_message));
}

void RenderWidget::OnSwapBuffersAborted() {
  TRACE_EVENT0("renderer", "RenderWidget::OnSwapBuffersAborted");
  while (!updates_pending_swap_.empty()) {
    ViewHostMsg_UpdateRect* msg = updates_pending_swap_.front();
    updates_pending_swap_.pop_front();
    // msg can be NULL if the swap doesn't correspond to an DoDeferredUpdate
    // compositing pass, hence doesn't require an UpdateRect message.
    if (msg)
      Send(msg);
  }
  num_swapbuffers_complete_pending_ = 0;
  using_asynchronous_swapbuffers_ = false;
  // Schedule another frame so the compositor learns about it.
  scheduleComposite();
}

void RenderWidget::OnSwapBuffersPosted() {
  TRACE_EVENT0("renderer", "RenderWidget::OnSwapBuffersPosted");

  if (using_asynchronous_swapbuffers_) {
    ViewHostMsg_UpdateRect* msg = NULL;
    // pending_update_params_ can be NULL if the swap doesn't correspond to an
    // DoDeferredUpdate compositing pass, hence doesn't require an UpdateRect
    // message.
    if (pending_update_params_) {
      msg = new ViewHostMsg_UpdateRect(routing_id_, *pending_update_params_);
      pending_update_params_.reset();
    }
    updates_pending_swap_.push_back(msg);
    num_swapbuffers_complete_pending_++;
  }
}

void RenderWidget::OnSwapBuffersComplete() {
  TRACE_EVENT0("renderer", "RenderWidget::OnSwapBuffersComplete");

  // Notify subclasses that composited rendering was flushed to the screen.
  DidFlushPaint();

  // When compositing deactivates, we reset the swapbuffers pending count.  The
  // swapbuffers acks may still arrive, however.
  if (num_swapbuffers_complete_pending_ == 0) {
    TRACE_EVENT0("renderer", "EarlyOut_ZeroSwapbuffersPending");
    return;
  }
  DCHECK(!updates_pending_swap_.empty());
  ViewHostMsg_UpdateRect* msg = updates_pending_swap_.front();
  updates_pending_swap_.pop_front();
  // msg can be NULL if the swap doesn't correspond to an DoDeferredUpdate
  // compositing pass, hence doesn't require an UpdateRect message.
  if (msg)
    Send(msg);
  num_swapbuffers_complete_pending_--;

  // If update reply is still pending, then defer the update until that reply
  // occurs.
  if (update_reply_pending_) {
    TRACE_EVENT0("renderer", "EarlyOut_UpdateReplyPending");
    return;
  }

  // If we are not accelerated rendering, then this is a stale swapbuffers from
  // when we were previously rendering. However, if an invalidation task is not
  // posted, there may be software rendering work pending. In that case, don't
  // early out.
  if (!is_accelerated_compositing_active_ && invalidation_task_posted_) {
    TRACE_EVENT0("renderer", "EarlyOut_AcceleratedCompositingOff");
    return;
  }

  // Do not call DoDeferredUpdate unless there's animation work to be done or
  // a real invalidation. This prevents rendering in response to a swapbuffers
  // callback coming back after we've navigated away from the page that
  // generated it.
  if (!animation_update_pending_ && !paint_aggregator_.HasPendingUpdate()) {
    TRACE_EVENT0("renderer", "EarlyOut_NoPendingUpdate");
    return;
  }

  // Continue painting if necessary...
  DoDeferredUpdateAndSendInputAck();
}

void RenderWidget::OnHandleInputEvent(const blink::WebInputEvent* input_event,
                                      const ui::LatencyInfo& latency_info,
                                      bool is_keyboard_shortcut) {
  handling_input_event_ = true;
  if (!input_event) {
    handling_input_event_ = false;
    return;
  }

  base::TimeTicks start_time;
  if (base::TimeTicks::IsHighResNowFastAndReliable())
    start_time = base::TimeTicks::HighResNow();

  const char* const event_name =
      WebInputEventTraits::GetName(input_event->type);
  TRACE_EVENT1("renderer", "RenderWidget::OnHandleInputEvent",
               "event", event_name);
  TRACE_EVENT_SYNTHETIC_DELAY_BEGIN("blink.HandleInputEvent");
  TRACE_EVENT_FLOW_STEP0(
      "input",
      "LatencyInfo.Flow",
      TRACE_ID_DONT_MANGLE(latency_info.trace_id),
      "HanldeInputEventMain");

  scoped_ptr<cc::SwapPromiseMonitor> latency_info_swap_promise_monitor;
  ui::LatencyInfo swap_latency_info(latency_info);
  if (compositor_) {
    latency_info_swap_promise_monitor =
        compositor_->CreateLatencyInfoSwapPromiseMonitor(&swap_latency_info)
            .Pass();
  } else {
    latency_info_.push_back(latency_info);
  }

  if (base::TimeTicks::IsHighResNowFastAndReliable()) {
    // If we don't have a high res timer, these metrics won't be accurate enough
    // to be worth collecting. Note that this does introduce some sampling bias.

    base::TimeDelta now = base::TimeDelta::FromInternalValue(
        base::TimeTicks::HighResNow().ToInternalValue());

    int64 delta =
        static_cast<int64>((now.InSecondsF() - input_event->timeStampSeconds) *
                           base::Time::kMicrosecondsPerSecond);

    UMA_HISTOGRAM_CUSTOM_COUNTS(
        "Event.AggregatedLatency.Renderer2", delta, 1, 10000000, 100);
    base::HistogramBase* counter_for_type = base::Histogram::FactoryGet(
        base::StringPrintf("Event.Latency.Renderer2.%s", event_name),
        1,
        10000000,
        100,
        base::HistogramBase::kUmaTargetedHistogramFlag);
    counter_for_type->Add(delta);
  }

  if (WebInputEvent::isUserGestureEventType(input_event->type))
    WillProcessUserGesture();

  bool prevent_default = false;
  if (WebInputEvent::isMouseEventType(input_event->type)) {
    const WebMouseEvent& mouse_event =
        *static_cast<const WebMouseEvent*>(input_event);
    TRACE_EVENT2("renderer", "HandleMouseMove",
                 "x", mouse_event.x, "y", mouse_event.y);
    context_menu_source_type_ = ui::MENU_SOURCE_MOUSE;
    prevent_default = WillHandleMouseEvent(mouse_event);
  }

  if (WebInputEvent::isKeyboardEventType(input_event->type)) {
    context_menu_source_type_ = ui::MENU_SOURCE_KEYBOARD;
#if defined(OS_ANDROID)
    // The DPAD_CENTER key on Android has a dual semantic: (1) in the general
    // case it should behave like a select key (i.e. causing a click if a button
    // is focused). However, if a text field is focused (2), its intended
    // behavior is to just show the IME and don't propagate the key.
    // A typical use case is a web form: the DPAD_CENTER should bring up the IME
    // when clicked on an input text field and cause the form submit if clicked
    // when the submit button is focused, but not vice-versa.
    // The UI layer takes care of translating DPAD_CENTER into a RETURN key,
    // but at this point we have to swallow the event for the scenario (2).
    const WebKeyboardEvent& key_event =
        *static_cast<const WebKeyboardEvent*>(input_event);
    if (key_event.nativeKeyCode == AKEYCODE_DPAD_CENTER &&
        GetTextInputType() != ui::TEXT_INPUT_TYPE_NONE) {
      OnShowImeIfNeeded();
      prevent_default = true;
    }
#endif
  }

  if (WebInputEvent::isGestureEventType(input_event->type)) {
    const WebGestureEvent& gesture_event =
        *static_cast<const WebGestureEvent*>(input_event);
    context_menu_source_type_ = ui::MENU_SOURCE_TOUCH;
    prevent_default = prevent_default || WillHandleGestureEvent(gesture_event);
  }

  if (input_event->type == WebInputEvent::TouchStart)
      handling_touchstart_event_ = true;

  bool processed = prevent_default;
  if (input_event->type != WebInputEvent::Char || !suppress_next_char_events_) {
    suppress_next_char_events_ = false;
    if (!processed && webwidget_)
      processed = webwidget_->handleInputEvent(*input_event);
  }

  handling_touchstart_event_ = false;

  // If this RawKeyDown event corresponds to a browser keyboard shortcut and
  // it's not processed by webkit, then we need to suppress the upcoming Char
  // events.
  if (!processed && is_keyboard_shortcut)
    suppress_next_char_events_ = true;

  InputEventAckState ack_result = processed ?
      INPUT_EVENT_ACK_STATE_CONSUMED : INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
  if (!processed &&  input_event->type == WebInputEvent::TouchStart) {
    const WebTouchEvent& touch_event =
        *static_cast<const WebTouchEvent*>(input_event);
    // Hit-test for all the pressed touch points. If there is a touch-handler
    // for any of the touch points, then the renderer should continue to receive
    // touch events.
    ack_result = INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS;
    for (size_t i = 0; i < touch_event.touchesLength; ++i) {
      if (touch_event.touches[i].state == WebTouchPoint::StatePressed &&
          HasTouchEventHandlersAt(
              gfx::ToFlooredPoint(touch_event.touches[i].position))) {
        ack_result = INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
        break;
      }
    }
  }

  bool event_type_can_be_rate_limited =
      input_event->type == WebInputEvent::MouseMove ||
      input_event->type == WebInputEvent::MouseWheel ||
      input_event->type == WebInputEvent::TouchMove;

  bool frame_pending = paint_aggregator_.HasPendingUpdate();
  if (is_accelerated_compositing_active_) {
    frame_pending = compositor_ &&
                    compositor_->BeginMainFrameRequested();
  }

  // If we don't have a fast and accurate HighResNow, we assume the input
  // handlers are heavy and rate limit them.
  bool rate_limiting_wanted = true;
  if (base::TimeTicks::IsHighResNowFastAndReliable()) {
      base::TimeTicks end_time = base::TimeTicks::HighResNow();
      total_input_handling_time_this_frame_ += (end_time - start_time);
      rate_limiting_wanted =
          total_input_handling_time_this_frame_.InMicroseconds() >
          kInputHandlingTimeThrottlingThresholdMicroseconds;
  }

  if (!WebInputEventTraits::IgnoresAckDisposition(input_event->type)) {
    scoped_ptr<IPC::Message> response(
        new InputHostMsg_HandleInputEvent_ACK(routing_id_,
                                              input_event->type,
                                              ack_result,
                                              swap_latency_info));
    if (rate_limiting_wanted && event_type_can_be_rate_limited &&
        frame_pending && !is_hidden_) {
      // We want to rate limit the input events in this case, so we'll wait for
      // painting to finish before ACKing this message.
      TRACE_EVENT_INSTANT0("renderer",
        "RenderWidget::OnHandleInputEvent ack throttled",
        TRACE_EVENT_SCOPE_THREAD);
      if (pending_input_event_ack_) {
        // As two different kinds of events could cause us to postpone an ack
        // we send it now, if we have one pending. The Browser should never
        // send us the same kind of event we are delaying the ack for.
        Send(pending_input_event_ack_.release());
      }
      pending_input_event_ack_ = response.Pass();
      if (compositor_)
        compositor_->NotifyInputThrottledUntilCommit();
    } else {
      Send(response.release());
    }
  }

#if defined(OS_ANDROID)
  // Allow the IME to be shown when the focus changes as a consequence
  // of a processed touch end event.
  if (input_event->type == WebInputEvent::TouchEnd && processed)
    UpdateTextInputState(true, true);
#elif defined(USE_AURA)
  // Show the virtual keyboard if enabled and a user gesture triggers a focus
  // change.
  if (processed && (input_event->type == WebInputEvent::TouchEnd ||
      input_event->type == WebInputEvent::MouseUp))
    UpdateTextInputState(true, false);
#endif

  TRACE_EVENT_SYNTHETIC_DELAY_END("blink.HandleInputEvent");
  handling_input_event_ = false;

  if (!prevent_default) {
    if (WebInputEvent::isKeyboardEventType(input_event->type))
      DidHandleKeyEvent();
    if (WebInputEvent::isMouseEventType(input_event->type))
      DidHandleMouseEvent(*(static_cast<const WebMouseEvent*>(input_event)));
    if (WebInputEvent::isTouchEventType(input_event->type))
      DidHandleTouchEvent(*(static_cast<const WebTouchEvent*>(input_event)));
  }
}

void RenderWidget::OnCursorVisibilityChange(bool is_visible) {
  if (webwidget_)
    webwidget_->setCursorVisibilityState(is_visible);
}

void RenderWidget::OnMouseCaptureLost() {
  if (webwidget_)
    webwidget_->mouseCaptureLost();
}

void RenderWidget::OnSetFocus(bool enable) {
  has_focus_ = enable;
  if (webwidget_)
    webwidget_->setFocus(enable);
}

void RenderWidget::ClearFocus() {
  // We may have got the focus from the browser before this gets processed, in
  // which case we do not want to unfocus ourself.
  if (!has_focus_ && webwidget_)
    webwidget_->setFocus(false);
}

void RenderWidget::PaintRect(const gfx::Rect& rect,
                             const gfx::Point& canvas_origin,
                             skia::PlatformCanvas* canvas) {
  TRACE_EVENT2("renderer", "PaintRect",
               "width", rect.width(), "height", rect.height());

  canvas->save();

  // Bring the canvas into the coordinate system of the paint rect.
  canvas->translate(static_cast<SkScalar>(-canvas_origin.x()),
                    static_cast<SkScalar>(-canvas_origin.y()));

  // If there is a custom background, tile it.
  if (!background_.empty()) {
    SkPaint paint;
    skia::RefPtr<SkShader> shader = skia::AdoptRef(
        SkShader::CreateBitmapShader(background_,
                                     SkShader::kRepeat_TileMode,
                                     SkShader::kRepeat_TileMode));
    paint.setShader(shader.get());

    // Use kSrc_Mode to handle background_ transparency properly.
    paint.setXfermodeMode(SkXfermode::kSrc_Mode);

    // Canvas could contain multiple update rects. Clip to given rect so that
    // we don't accidentally clear other update rects.
    canvas->save();
    canvas->scale(device_scale_factor_, device_scale_factor_);
    canvas->clipRect(gfx::RectToSkRect(rect));
    canvas->drawPaint(paint);
    canvas->restore();
  }

  // First see if this rect is a plugin that can paint itself faster.
  TransportDIB* optimized_dib = NULL;
  gfx::Rect optimized_copy_rect, optimized_copy_location;
  float dib_scale_factor;
  PepperPluginInstanceImpl* optimized_instance =
      GetBitmapForOptimizedPluginPaint(rect, &optimized_dib,
                                       &optimized_copy_location,
                                       &optimized_copy_rect,
                                       &dib_scale_factor);
  if (optimized_instance) {
#if defined(ENABLE_PLUGINS)
    // This plugin can be optimize-painted and we can just ask it to paint
    // itself. We don't actually need the TransportDIB in this case.
    //
    // This is an optimization for PPAPI plugins that know they're on top of
    // the page content. If this rect is inside such a plugin, we can save some
    // time and avoid re-rendering the page content which we know will be
    // covered by the plugin later (this time can be significant, especially
    // for a playing movie that is invalidating a lot).
    //
    // In the plugin movie case, hopefully the similar call to
    // GetBitmapForOptimizedPluginPaint in DoDeferredUpdate handles the
    // painting, because that avoids copying the plugin image to a different
    // paint rect. Unfortunately, if anything on the page is animating other
    // than the movie, it break this optimization since the union of the
    // invalid regions will be larger than the plugin.
    //
    // This code optimizes that case, where we can still avoid painting in
    // WebKit and filling the background (which can be slow) and just painting
    // the plugin. Unlike the DoDeferredUpdate case, an extra copy is still
    // required.
    SkAutoCanvasRestore auto_restore(canvas, true);
    canvas->scale(device_scale_factor_, device_scale_factor_);
    optimized_instance->Paint(canvas, optimized_copy_location, rect);
    canvas->restore();
#endif
  } else {
    // Normal painting case.
    base::TimeTicks start_time;
    if (!is_accelerated_compositing_active_)
      start_time = legacy_software_mode_stats_->StartRecording();

    webwidget_->paint(canvas, rect);

    if (!is_accelerated_compositing_active_) {
      base::TimeDelta paint_time =
          legacy_software_mode_stats_->EndRecording(start_time);
      int64 painted_pixel_count = rect.width() * rect.height();
      legacy_software_mode_stats_->AddPaint(paint_time, painted_pixel_count);
    }

    // Flush to underlying bitmap.  TODO(darin): is this needed?
    skia::GetTopDevice(*canvas)->accessBitmap(false);
  }

  PaintDebugBorder(rect, canvas);
  canvas->restore();
}

void RenderWidget::PaintDebugBorder(const gfx::Rect& rect,
                                    skia::PlatformCanvas* canvas) {
  static bool kPaintBorder =
      CommandLine::ForCurrentProcess()->HasSwitch(switches::kShowPaintRects);
  if (!kPaintBorder)
    return;

  // Cycle through these colors to help distinguish new paint rects.
  const SkColor colors[] = {
    SkColorSetARGB(0x3F, 0xFF, 0, 0),
    SkColorSetARGB(0x3F, 0xFF, 0, 0xFF),
    SkColorSetARGB(0x3F, 0, 0, 0xFF),
  };
  static int color_selector = 0;

  SkPaint paint;
  paint.setStyle(SkPaint::kStroke_Style);
  paint.setColor(colors[color_selector++ % arraysize(colors)]);
  paint.setStrokeWidth(1);

  SkIRect irect;
  irect.set(rect.x(), rect.y(), rect.right() - 1, rect.bottom() - 1);
  canvas->drawIRect(irect, paint);
}

void RenderWidget::AnimationCallback() {
  TRACE_EVENT0("renderer", "RenderWidget::AnimationCallback");
  if (!animation_update_pending_) {
    TRACE_EVENT0("renderer", "EarlyOut_NoAnimationUpdatePending");
    return;
  }
  if (!animation_floor_time_.is_null() && IsRenderingVSynced()) {
    // Record when we fired (according to base::Time::Now()) relative to when
    // we posted the task to quantify how much the base::Time/base::TimeTicks
    // skew is affecting animations.
    base::TimeDelta animation_callback_delay = base::Time::Now() -
        (animation_floor_time_ - base::TimeDelta::FromMilliseconds(16));
    UMA_HISTOGRAM_CUSTOM_TIMES("Renderer4.AnimationCallbackDelayTime",
                               animation_callback_delay,
                               base::TimeDelta::FromMilliseconds(0),
                               base::TimeDelta::FromMilliseconds(30),
                               25);
  }
  DoDeferredUpdateAndSendInputAck();
}

void RenderWidget::AnimateIfNeeded() {
  if (!animation_update_pending_)
    return;

  // Target 60FPS if vsync is on. Go as fast as we can if vsync is off.
  base::TimeDelta animationInterval = IsRenderingVSynced() ?
      base::TimeDelta::FromMilliseconds(16) : base::TimeDelta();

  base::Time now = base::Time::Now();

  // animation_floor_time_ is the earliest time that we should animate when
  // using the dead reckoning software scheduler. If we're using swapbuffers
  // complete callbacks to rate limit, we can ignore this floor.
  if (now >= animation_floor_time_ || num_swapbuffers_complete_pending_ > 0) {
    TRACE_EVENT0("renderer", "RenderWidget::AnimateIfNeeded")
    animation_floor_time_ = now + animationInterval;
    // Set a timer to call us back after animationInterval before
    // running animation callbacks so that if a callback requests another
    // we'll be sure to run it at the proper time.
    animation_timer_.Stop();
    animation_timer_.Start(FROM_HERE, animationInterval, this,
                           &RenderWidget::AnimationCallback);
    animation_update_pending_ = false;
    if (is_accelerated_compositing_active_ && compositor_) {
      compositor_->UpdateAnimations(base::TimeTicks::Now());
    } else {
      double frame_begin_time =
        (base::TimeTicks::Now() - base::TimeTicks()).InSecondsF();
      webwidget_->animate(frame_begin_time);
    }
    return;
  }
  TRACE_EVENT0("renderer", "EarlyOut_AnimatedTooRecently");
  if (!animation_timer_.IsRunning()) {
    // This code uses base::Time::Now() to calculate the floor and next fire
    // time because javascript's Date object uses base::Time::Now().  The
    // message loop uses base::TimeTicks, which on windows can have a
    // different granularity than base::Time.
    // The upshot of all this is that this function might be called before
    // base::Time::Now() has advanced past the animation_floor_time_.  To
    // avoid exposing this delay to javascript, we keep posting delayed
    // tasks until base::Time::Now() has advanced far enough.
    base::TimeDelta delay = animation_floor_time_ - now;
    animation_timer_.Start(FROM_HERE, delay, this,
                           &RenderWidget::AnimationCallback);
  }
}

bool RenderWidget::IsRenderingVSynced() {
  // TODO(nduca): Forcing a driver to disable vsync (e.g. in a control panel) is
  // not caught by this check. This will lead to artificially low frame rates
  // for people who force vsync off at a driver level and expect Chrome to speed
  // up.
  return !has_disable_gpu_vsync_switch_;
}

void RenderWidget::InvalidationCallback() {
  TRACE_EVENT0("renderer", "RenderWidget::InvalidationCallback");
  invalidation_task_posted_ = false;
  DoDeferredUpdateAndSendInputAck();
}

void RenderWidget::FlushPendingInputEventAck() {
  if (pending_input_event_ack_)
    Send(pending_input_event_ack_.release());
  total_input_handling_time_this_frame_ = base::TimeDelta();
}

void RenderWidget::DoDeferredUpdateAndSendInputAck() {
  DoDeferredUpdate();
  FlushPendingInputEventAck();
}

void RenderWidget::DoDeferredUpdate() {
  TRACE_EVENT0("renderer", "RenderWidget::DoDeferredUpdate");
  TRACE_EVENT_SCOPED_SAMPLING_STATE("Chrome", "Paint");

  if (!webwidget_)
    return;

  if (!init_complete_) {
    TRACE_EVENT0("renderer", "EarlyOut_InitNotComplete");
    return;
  }
  if (update_reply_pending_) {
    TRACE_EVENT0("renderer", "EarlyOut_UpdateReplyPending");
    return;
  }
  if (is_accelerated_compositing_active_ &&
      num_swapbuffers_complete_pending_ >= kMaxSwapBuffersPending) {
    TRACE_EVENT0("renderer", "EarlyOut_MaxSwapBuffersPending");
    return;
  }

  // Suppress updating when we are hidden.
  if (is_hidden_ || size_.IsEmpty() || is_swapped_out_) {
    paint_aggregator_.ClearPendingUpdate();
    needs_repainting_on_restore_ = true;
    TRACE_EVENT0("renderer", "EarlyOut_NotVisible");
    return;
  }

  // Tracking of frame rate jitter
  base::TimeTicks frame_begin_ticks = gfx::FrameTime::Now();
  InstrumentWillBeginFrame(0);
  AnimateIfNeeded();

  // Layout may generate more invalidation.  It may also enable the
  // GPU acceleration, so make sure to run layout before we send the
  // GpuRenderingActivated message.
  webwidget_->layout();

  // Check for whether we need to track swap buffers. We need to do that after
  // layout() because it may have switched us to accelerated compositing.
  if (is_accelerated_compositing_active_)
    using_asynchronous_swapbuffers_ = SupportsAsynchronousSwapBuffers();

  // The following two can result in further layout and possibly
  // enable GPU acceleration so they need to be called before any painting
  // is done.
  UpdateTextInputType();
#if defined(OS_ANDROID)
  UpdateSelectionRootBounds();
#endif
  UpdateSelectionBounds();

  // Suppress painting if nothing is dirty.  This has to be done after updating
  // animations running layout as these may generate further invalidations.
  if (!paint_aggregator_.HasPendingUpdate()) {
    TRACE_EVENT0("renderer", "EarlyOut_NoPendingUpdate");
    InstrumentDidCancelFrame();
    return;
  }

  if (!is_accelerated_compositing_active_ &&
      !is_threaded_compositing_enabled_ &&
      (ForceCompositingModeEnabled() ||
          was_accelerated_compositing_ever_active_)) {
    webwidget_->enterForceCompositingMode(true);
  }

  if (!last_do_deferred_update_time_.is_null()) {
    base::TimeDelta delay = frame_begin_ticks - last_do_deferred_update_time_;
    if (is_accelerated_compositing_active_) {
      UMA_HISTOGRAM_CUSTOM_TIMES("Renderer4.AccelDoDeferredUpdateDelay",
                                 delay,
                                 base::TimeDelta::FromMilliseconds(1),
                                 base::TimeDelta::FromMilliseconds(120),
                                 60);
    } else {
      UMA_HISTOGRAM_CUSTOM_TIMES("Renderer4.SoftwareDoDeferredUpdateDelay",
                                 delay,
                                 base::TimeDelta::FromMilliseconds(1),
                                 base::TimeDelta::FromMilliseconds(120),
                                 60);
    }

    // Calculate filtered time per frame:
    float frame_time_elapsed = static_cast<float>(delay.InSecondsF());
    filtered_time_per_frame_ =
        0.9f * filtered_time_per_frame_ + 0.1f * frame_time_elapsed;
  }
  last_do_deferred_update_time_ = frame_begin_ticks;

  if (!is_accelerated_compositing_active_) {
    legacy_software_mode_stats_->IncrementFrameCount(1, true);
    cc::BenchmarkInstrumentation::IssueMainThreadRenderingStatsEvent(
        legacy_software_mode_stats_->main_thread_rendering_stats());
    legacy_software_mode_stats_->AccumulateAndClearMainThreadStats();
  }

  // OK, save the pending update to a local since painting may cause more
  // invalidation.  Some WebCore rendering objects only layout when painted.
  PaintAggregator::PendingUpdate update;
  paint_aggregator_.PopPendingUpdate(&update);

  gfx::Rect scroll_damage = update.GetScrollDamage();
  gfx::Rect bounds = gfx::UnionRects(update.GetPaintBounds(), scroll_damage);

  // A plugin may be able to do an optimized paint. First check this, in which
  // case we can skip all of the bitmap generation and regular paint code.
  // This optimization allows PPAPI plugins that declare themselves on top of
  // the page (like a traditional windowed plugin) to be able to animate (think
  // movie playing) without repeatedly re-painting the page underneath, or
  // copying the plugin backing store (since we can send the plugin's backing
  // store directly to the browser).
  //
  // This optimization only works when the entire invalid region is contained
  // within the plugin. There is a related optimization in PaintRect for the
  // case where there may be multiple invalid regions.
  TransportDIB* dib = NULL;
  gfx::Rect optimized_copy_rect, optimized_copy_location;
  float dib_scale_factor = 1;
  DCHECK(!pending_update_params_.get());
  pending_update_params_.reset(new ViewHostMsg_UpdateRect_Params);
  pending_update_params_->scroll_delta = update.scroll_delta;
  pending_update_params_->scroll_rect = update.scroll_rect;
  pending_update_params_->view_size = size_;
  pending_update_params_->plugin_window_moves.swap(plugin_window_moves_);
  pending_update_params_->flags = next_paint_flags_;
  pending_update_params_->scroll_offset = GetScrollOffset();
  pending_update_params_->needs_ack = true;
  pending_update_params_->scale_factor = device_scale_factor_;
  next_paint_flags_ = 0;
  need_update_rect_for_auto_resize_ = false;

  if (!is_accelerated_compositing_active_)
    pending_update_params_->latency_info.swap(latency_info_);

  latency_info_.clear();

  if (update.scroll_rect.IsEmpty() &&
      !is_accelerated_compositing_active_ &&
      GetBitmapForOptimizedPluginPaint(bounds, &dib, &optimized_copy_location,
                                       &optimized_copy_rect,
                                       &dib_scale_factor)) {
    // Only update the part of the plugin that actually changed.
    optimized_copy_rect.Intersect(bounds);
    pending_update_params_->bitmap = dib->id();
    pending_update_params_->bitmap_rect = optimized_copy_location;
    pending_update_params_->copy_rects.push_back(optimized_copy_rect);
    pending_update_params_->scale_factor = dib_scale_factor;
  } else if (!is_accelerated_compositing_active_) {
    // Compute a buffer for painting and cache it.

    bool fractional_scale = device_scale_factor_ -
        static_cast<int>(device_scale_factor_) != 0;
    if (fractional_scale) {
      // Damage might not be DIP aligned. Inflate damage to compensate.
      bounds.Inset(-1, -1);
      bounds.Intersect(gfx::Rect(size_));
    }

    gfx::Rect pixel_bounds = gfx::ToEnclosingRect(
        gfx::ScaleRect(bounds, device_scale_factor_));

    scoped_ptr<skia::PlatformCanvas> canvas(
        RenderProcess::current()->GetDrawingCanvas(&current_paint_buf_,
                                                   pixel_bounds));
    if (!canvas) {
      NOTREACHED();
      return;
    }

    // We may get back a smaller canvas than we asked for.
    // TODO(darin): This seems like it could cause painting problems!
    DCHECK_EQ(pixel_bounds.width(), canvas->getDevice()->width());
    DCHECK_EQ(pixel_bounds.height(), canvas->getDevice()->height());
    pixel_bounds.set_width(canvas->getDevice()->width());
    pixel_bounds.set_height(canvas->getDevice()->height());
    bounds.set_width(pixel_bounds.width() / device_scale_factor_);
    bounds.set_height(pixel_bounds.height() / device_scale_factor_);

    HISTOGRAM_COUNTS_100("MPArch.RW_PaintRectCount", update.paint_rects.size());

    pending_update_params_->bitmap = current_paint_buf_->id();
    pending_update_params_->bitmap_rect = bounds;

    std::vector<gfx::Rect>& copy_rects = pending_update_params_->copy_rects;
    // The scroll damage is just another rectangle to paint and copy.
    copy_rects.swap(update.paint_rects);
    if (!scroll_damage.IsEmpty())
      copy_rects.push_back(scroll_damage);

    for (size_t i = 0; i < copy_rects.size(); ++i) {
      gfx::Rect rect = copy_rects[i];
      if (fractional_scale) {
        // Damage might not be DPI aligned.  Inflate rect to compensate.
        rect.Inset(-1, -1);
      }
      PaintRect(rect, pixel_bounds.origin(), canvas.get());
    }

    // Software FPS tick for performance tests. The accelerated path traces the
    // frame events in didCommitAndDrawCompositorFrame. See
    // tab_capture_performancetest.cc.
    // NOTE: Tests may break if this event is renamed or moved.
    UNSHIPPED_TRACE_EVENT_INSTANT0("test_fps", "TestFrameTickSW",
                                   TRACE_EVENT_SCOPE_THREAD);
  } else {  // Accelerated compositing path
    // Begin painting.
    // If painting is done via the gpu process then we don't set any damage
    // rects to save the browser process from doing unecessary work.
    pending_update_params_->bitmap_rect = bounds;
    pending_update_params_->scroll_rect = gfx::Rect();
    // We don't need an ack, because we're not sharing a DIB with the browser.
    // If it needs to (e.g. composited UI), the GPU process does its own ACK
    // with the browser for the GPU surface.
    pending_update_params_->needs_ack = false;
    Composite(frame_begin_ticks);
  }

  // If we're holding a pending input event ACK, send the ACK before sending the
  // UpdateReply message so we can receive another input event before the
  // UpdateRect_ACK on platforms where the UpdateRect_ACK is sent from within
  // the UpdateRect IPC message handler.
  FlushPendingInputEventAck();

  // If Composite() called SwapBuffers, pending_update_params_ will be reset (in
  // OnSwapBuffersPosted), meaning a message has been added to the
  // updates_pending_swap_ queue, that will be sent later. Otherwise, we send
  // the message now.
  if (pending_update_params_) {
    // sending an ack to browser process that the paint is complete...
    update_reply_pending_ = pending_update_params_->needs_ack;
    Send(new ViewHostMsg_UpdateRect(routing_id_, *pending_update_params_));
    pending_update_params_.reset();
  }

  // If we're software rendering then we're done initiating the paint.
  if (!is_accelerated_compositing_active_)
    DidInitiatePaint();
}

void RenderWidget::Composite(base::TimeTicks frame_begin_time) {
  DCHECK(is_accelerated_compositing_active_);
  if (compositor_)  // TODO(jamesr): Figure out how this can be null.
    compositor_->Composite(frame_begin_time);
}

///////////////////////////////////////////////////////////////////////////////
// WebWidgetClient

void RenderWidget::didInvalidateRect(const WebRect& rect) {
  // The invalidated rect might be outside the bounds of the view.
  gfx::Rect view_rect(size_);
  gfx::Rect damaged_rect = gfx::IntersectRects(view_rect, rect);
  if (damaged_rect.IsEmpty())
    return;

  paint_aggregator_.InvalidateRect(damaged_rect);

  // We may not need to schedule another call to DoDeferredUpdate.
  if (invalidation_task_posted_)
    return;
  if (!paint_aggregator_.HasPendingUpdate())
    return;
  if (update_reply_pending_ ||
      num_swapbuffers_complete_pending_ >= kMaxSwapBuffersPending)
    return;

  // When GPU rendering, combine pending animations and invalidations into
  // a single update.
  if (is_accelerated_compositing_active_ &&
      animation_update_pending_ &&
      animation_timer_.IsRunning())
    return;

  // Perform updating asynchronously.  This serves two purposes:
  // 1) Ensures that we call WebView::Paint without a bunch of other junk
  //    on the call stack.
  // 2) Allows us to collect more damage rects before painting to help coalesce
  //    the work that we will need to do.
  invalidation_task_posted_ = true;
  base::MessageLoop::current()->PostTask(
      FROM_HERE, base::Bind(&RenderWidget::InvalidationCallback, this));
}

void RenderWidget::didScrollRect(int dx, int dy,
                                 const WebRect& clip_rect) {
  // Drop scrolls on the floor when we are in compositing mode.
  // TODO(nduca): stop WebViewImpl from sending scrolls in the first place.
  if (is_accelerated_compositing_active_)
    return;

  // The scrolled rect might be outside the bounds of the view.
  gfx::Rect view_rect(size_);
  gfx::Rect damaged_rect = gfx::IntersectRects(view_rect, clip_rect);
  if (damaged_rect.IsEmpty())
    return;

  paint_aggregator_.ScrollRect(gfx::Vector2d(dx, dy), damaged_rect);

  // We may not need to schedule another call to DoDeferredUpdate.
  if (invalidation_task_posted_)
    return;
  if (!paint_aggregator_.HasPendingUpdate())
    return;
  if (update_reply_pending_ ||
      num_swapbuffers_complete_pending_ >= kMaxSwapBuffersPending)
    return;

  // When GPU rendering, combine pending animations and invalidations into
  // a single update.
  if (is_accelerated_compositing_active_ &&
      animation_update_pending_ &&
      animation_timer_.IsRunning())
    return;

  // Perform updating asynchronously.  This serves two purposes:
  // 1) Ensures that we call WebView::Paint without a bunch of other junk
  //    on the call stack.
  // 2) Allows us to collect more damage rects before painting to help coalesce
  //    the work that we will need to do.
  invalidation_task_posted_ = true;
  base::MessageLoop::current()->PostTask(
      FROM_HERE, base::Bind(&RenderWidget::InvalidationCallback, this));
}

void RenderWidget::didAutoResize(const WebSize& new_size) {
  if (size_.width() != new_size.width || size_.height() != new_size.height) {
    size_ = new_size;

    // If we don't clear PaintAggregator after changing autoResize state, then
    // we might end up in a situation where bitmap_rect is larger than the
    // view_size. By clearing PaintAggregator, we ensure that we don't end up
    // with invalid damage rects.
    paint_aggregator_.ClearPendingUpdate();

    if (resizing_mode_selector_->is_synchronous_mode()) {
      WebRect new_pos(rootWindowRect().x,
                      rootWindowRect().y,
                      new_size.width,
                      new_size.height);
      view_screen_rect_ = new_pos;
      window_screen_rect_ = new_pos;
    }

    AutoResizeCompositor();

    if (!resizing_mode_selector_->is_synchronous_mode())
      need_update_rect_for_auto_resize_ = true;
  }
}

void RenderWidget::AutoResizeCompositor()  {
  physical_backing_size_ = gfx::ToCeiledSize(gfx::ScaleSize(size_,
      device_scale_factor_));
  if (compositor_)
    compositor_->setViewportSize(size_, physical_backing_size_);
}

// FIXME: To be removed as soon as chromium and blink side changes land
// didActivateCompositor with parameters is still kept in order to land
// these changes s-chromium - https://codereview.chromium.org/137893025/.
// s-blink - https://codereview.chromium.org/138523003/
void RenderWidget::didActivateCompositor(int input_handler_identifier) {
  TRACE_EVENT0("gpu", "RenderWidget::didActivateCompositor");

#if !defined(OS_MACOSX)
  if (!is_accelerated_compositing_active_) {
    // When not in accelerated compositing mode, in certain cases (e.g. waiting
    // for a resize or if no backing store) the RenderWidgetHost is blocking the
    // browser's UI thread for some time, waiting for an UpdateRect. If we are
    // going to switch to accelerated compositing, the GPU process may need
    // round-trips to the browser's UI thread before finishing the frame,
    // causing deadlocks if we delay the UpdateRect until we receive the
    // OnSwapBuffersComplete.  So send a dummy message that will unblock the
    // browser's UI thread. This is not necessary on Mac, because SwapBuffers
    // now unblocks GetBackingStore on Mac.
    Send(new ViewHostMsg_UpdateIsDelayed(routing_id_));
  }
#endif

  is_accelerated_compositing_active_ = true;
  Send(new ViewHostMsg_DidActivateAcceleratedCompositing(
      routing_id_, is_accelerated_compositing_active_));

  if (!was_accelerated_compositing_ever_active_) {
    was_accelerated_compositing_ever_active_ = true;
    webwidget_->enterForceCompositingMode(true);
  }
}

void RenderWidget::didActivateCompositor() {
  TRACE_EVENT0("gpu", "RenderWidget::didActivateCompositor");

#if !defined(OS_MACOSX)
  if (!is_accelerated_compositing_active_) {
    // When not in accelerated compositing mode, in certain cases (e.g. waiting
    // for a resize or if no backing store) the RenderWidgetHost is blocking the
    // browser's UI thread for some time, waiting for an UpdateRect. If we are
    // going to switch to accelerated compositing, the GPU process may need
    // round-trips to the browser's UI thread before finishing the frame,
    // causing deadlocks if we delay the UpdateRect until we receive the
    // OnSwapBuffersComplete.  So send a dummy message that will unblock the
    // browser's UI thread. This is not necessary on Mac, because SwapBuffers
    // now unblocks GetBackingStore on Mac.
    Send(new ViewHostMsg_UpdateIsDelayed(routing_id_));
  }
#endif

  is_accelerated_compositing_active_ = true;
  Send(new ViewHostMsg_DidActivateAcceleratedCompositing(
      routing_id_, is_accelerated_compositing_active_));

  if (!was_accelerated_compositing_ever_active_) {
    was_accelerated_compositing_ever_active_ = true;
    webwidget_->enterForceCompositingMode(true);
  }
}

void RenderWidget::didDeactivateCompositor() {
  TRACE_EVENT0("gpu", "RenderWidget::didDeactivateCompositor");

  is_accelerated_compositing_active_ = false;
  Send(new ViewHostMsg_DidActivateAcceleratedCompositing(
      routing_id_, is_accelerated_compositing_active_));

  if (using_asynchronous_swapbuffers_)
    using_asynchronous_swapbuffers_ = false;

  // In single-threaded mode, we exit force compositing mode and re-enter in
  // DoDeferredUpdate() if appropriate. In threaded compositing mode,
  // DoDeferredUpdate() is bypassed and WebKit is responsible for exiting and
  // entering force compositing mode at the appropriate times.
  if (!is_threaded_compositing_enabled_)
    webwidget_->enterForceCompositingMode(false);
}

void RenderWidget::initializeLayerTreeView() {
  compositor_ = RenderWidgetCompositor::Create(
      this, is_threaded_compositing_enabled_);
  if (!compositor_)
    return;

  compositor_->setViewportSize(size_, physical_backing_size_);
  if (init_complete_)
    compositor_->setSurfaceReady();
}

blink::WebLayerTreeView* RenderWidget::layerTreeView() {
  return compositor_.get();
}

void RenderWidget::suppressCompositorScheduling(bool enable) {
  if (compositor_)
    compositor_->SetSuppressScheduleComposite(enable);
}

void RenderWidget::willBeginCompositorFrame() {
  TRACE_EVENT0("gpu", "RenderWidget::willBeginCompositorFrame");

  DCHECK(RenderThreadImpl::current()->compositor_message_loop_proxy().get());

  // The following two can result in further layout and possibly
  // enable GPU acceleration so they need to be called before any painting
  // is done.
  UpdateTextInputType();
#if defined(OS_ANDROID)
  UpdateTextInputState(false, true);
  UpdateSelectionRootBounds();
#endif
  UpdateSelectionBounds();
}

void RenderWidget::didBecomeReadyForAdditionalInput() {
  TRACE_EVENT0("renderer", "RenderWidget::didBecomeReadyForAdditionalInput");
  FlushPendingInputEventAck();
}

void RenderWidget::DidCommitCompositorFrame() {
  FOR_EACH_OBSERVER(RenderFrameImpl, swapped_out_frames_,
                    DidCommitCompositorFrame());
}

void RenderWidget::didCommitAndDrawCompositorFrame() {
  TRACE_EVENT0("gpu", "RenderWidget::didCommitAndDrawCompositorFrame");
  // Accelerated FPS tick for performance tests. See
  // tab_capture_performancetest.cc.  NOTE: Tests may break if this event is
  // renamed or moved.
  UNSHIPPED_TRACE_EVENT_INSTANT0("test_fps", "TestFrameTickGPU",
                                 TRACE_EVENT_SCOPE_THREAD);
  // Notify subclasses that we initiated the paint operation.
  DidInitiatePaint();
}

void RenderWidget::didCompleteSwapBuffers() {
  TRACE_EVENT0("renderer", "RenderWidget::didCompleteSwapBuffers");

  // Notify subclasses threaded composited rendering was flushed to the screen.
  DidFlushPaint();

  if (update_reply_pending_)
    return;

  if (!next_paint_flags_ &&
      !need_update_rect_for_auto_resize_ &&
      !plugin_window_moves_.size()) {
    return;
  }

  ViewHostMsg_UpdateRect_Params params;
  params.view_size = size_;
  params.plugin_window_moves.swap(plugin_window_moves_);
  params.flags = next_paint_flags_;
  params.scroll_offset = GetScrollOffset();
  params.needs_ack = false;
  params.scale_factor = device_scale_factor_;

  Send(new ViewHostMsg_UpdateRect(routing_id_, params));
  next_paint_flags_ = 0;
  need_update_rect_for_auto_resize_ = false;
}

void RenderWidget::scheduleComposite() {
  if (RenderThreadImpl::current()->compositor_message_loop_proxy().get() &&
      compositor_) {
      compositor_->setNeedsAnimate();
  } else {
    // TODO(nduca): replace with something a little less hacky.  The reason this
    // hack is still used is because the Invalidate-DoDeferredUpdate loop
    // contains a lot of host-renderer synchronization logic that is still
    // important for the accelerated compositing case. The option of simply
    // duplicating all that code is less desirable than "faking out" the
    // invalidation path using a magical damage rect.
    didInvalidateRect(WebRect(0, 0, 1, 1));
  }
}

void RenderWidget::scheduleAnimation() {
  if (animation_update_pending_)
    return;

  TRACE_EVENT0("gpu", "RenderWidget::scheduleAnimation");
  animation_update_pending_ = true;
  if (!animation_timer_.IsRunning()) {
    animation_timer_.Start(FROM_HERE, base::TimeDelta::FromSeconds(0), this,
                           &RenderWidget::AnimationCallback);
  }
}

void RenderWidget::didChangeCursor(const WebCursorInfo& cursor_info) {
  // TODO(darin): Eliminate this temporary.
  WebCursor cursor;
  InitializeCursorFromWebKitCursorInfo(&cursor, cursor_info);
  // Only send a SetCursor message if we need to make a change.
  if (!current_cursor_.IsEqual(cursor)) {
    current_cursor_ = cursor;
    Send(new ViewHostMsg_SetCursor(routing_id_, cursor));
  }
}

// We are supposed to get a single call to Show for a newly created RenderWidget
// that was created via RenderWidget::CreateWebView.  So, we wait until this
// point to dispatch the ShowWidget message.
//
// This method provides us with the information about how to display the newly
// created RenderWidget (i.e., as a blocked popup or as a new tab).
//
void RenderWidget::show(WebNavigationPolicy) {
  DCHECK(!did_show_) << "received extraneous Show call";
  DCHECK(routing_id_ != MSG_ROUTING_NONE);
  DCHECK(opener_id_ != MSG_ROUTING_NONE);

  if (did_show_)
    return;

  did_show_ = true;
  // NOTE: initial_pos_ may still have its default values at this point, but
  // that's okay.  It'll be ignored if as_popup is false, or the browser
  // process will impose a default position otherwise.
  Send(new ViewHostMsg_ShowWidget(opener_id_, routing_id_, initial_pos_));
  SetPendingWindowRect(initial_pos_);
}

void RenderWidget::didFocus() {
}

void RenderWidget::didBlur() {
}

void RenderWidget::DoDeferredClose() {
  Send(new ViewHostMsg_Close(routing_id_));
}

void RenderWidget::closeWidgetSoon() {
  if (is_swapped_out_) {
    // This widget is currently swapped out, and the active widget is in a
    // different process.  Have the browser route the close request to the
    // active widget instead, so that the correct unload handlers are run.
    Send(new ViewHostMsg_RouteCloseEvent(routing_id_));
    return;
  }

  // If a page calls window.close() twice, we'll end up here twice, but that's
  // OK.  It is safe to send multiple Close messages.

  // Ask the RenderWidgetHost to initiate close.  We could be called from deep
  // in Javascript.  If we ask the RendwerWidgetHost to close now, the window
  // could be closed before the JS finishes executing.  So instead, post a
  // message back to the message loop, which won't run until the JS is
  // complete, and then the Close message can be sent.
  base::MessageLoop::current()->PostTask(
      FROM_HERE, base::Bind(&RenderWidget::DoDeferredClose, this));
}

void RenderWidget::QueueSyntheticGesture(
    scoped_ptr<SyntheticGestureParams> gesture_params,
    const SyntheticGestureCompletionCallback& callback) {
  DCHECK(!callback.is_null());

  pending_synthetic_gesture_callbacks_.push(callback);

  SyntheticGesturePacket gesture_packet;
  gesture_packet.set_gesture_params(gesture_params.Pass());

  Send(new InputHostMsg_QueueSyntheticGesture(routing_id_, gesture_packet));
}

void RenderWidget::Close() {
  if (webwidget_) {
    webwidget_->willCloseLayerTreeView();
    compositor_.reset();
    webwidget_->close();
    webwidget_ = NULL;
  }
}

WebRect RenderWidget::windowRect() {
  if (pending_window_rect_count_)
    return pending_window_rect_;

  return view_screen_rect_;
}

void RenderWidget::setToolTipText(const blink::WebString& text,
                                  WebTextDirection hint) {
  Send(new ViewHostMsg_SetTooltipText(routing_id_, text, hint));
}

void RenderWidget::setWindowRect(const WebRect& rect) {
  WebRect pos = rect;
  if (popup_origin_scale_for_emulation_) {
    float scale = popup_origin_scale_for_emulation_;
    pos.x = popup_screen_origin_for_emulation_.x() +
        (pos.x - popup_view_origin_for_emulation_.x()) * scale;
    pos.y = popup_screen_origin_for_emulation_.y() +
        (pos.y - popup_view_origin_for_emulation_.y()) * scale;
  }

  if (!resizing_mode_selector_->is_synchronous_mode()) {
    if (did_show_) {
      Send(new ViewHostMsg_RequestMove(routing_id_, pos));
      SetPendingWindowRect(pos);
    } else {
      initial_pos_ = pos;
    }
  } else {
    ResizeSynchronously(pos);
  }
}

void RenderWidget::SetPendingWindowRect(const WebRect& rect) {
  pending_window_rect_ = rect;
  pending_window_rect_count_++;
}

WebRect RenderWidget::rootWindowRect() {
  if (pending_window_rect_count_) {
    // NOTE(mbelshe): If there is a pending_window_rect_, then getting
    // the RootWindowRect is probably going to return wrong results since the
    // browser may not have processed the Move yet.  There isn't really anything
    // good to do in this case, and it shouldn't happen - since this size is
    // only really needed for windowToScreen, which is only used for Popups.
    return pending_window_rect_;
  }

  return window_screen_rect_;
}

WebRect RenderWidget::windowResizerRect() {
  return resizer_rect_;
}

void RenderWidget::OnSetInputMethodActive(bool is_active) {
  // To prevent this renderer process from sending unnecessary IPC messages to
  // a browser process, we permit the renderer process to send IPC messages
  // only during the input method attached to the browser process is active.
  input_method_is_active_ = is_active;
}

void RenderWidget::OnCandidateWindowShown() {
  webwidget_->didShowCandidateWindow();
}

void RenderWidget::OnCandidateWindowUpdated() {
  webwidget_->didUpdateCandidateWindow();
}

void RenderWidget::OnCandidateWindowHidden() {
  webwidget_->didHideCandidateWindow();
}

void RenderWidget::OnImeSetComposition(
    const base::string16& text,
    const std::vector<WebCompositionUnderline>& underlines,
    int selection_start, int selection_end) {
  if (!ShouldHandleImeEvent())
    return;
  ImeEventGuard guard(this);
  if (!webwidget_->setComposition(
      text, WebVector<WebCompositionUnderline>(underlines),
      selection_start, selection_end)) {
    // If we failed to set the composition text, then we need to let the browser
    // process to cancel the input method's ongoing composition session, to make
    // sure we are in a consistent state.
    Send(new ViewHostMsg_ImeCancelComposition(routing_id()));
  }
#if defined(OS_MACOSX) || defined(OS_WIN) || defined(USE_AURA)
  UpdateCompositionInfo(true);
#endif
}

void RenderWidget::OnImeConfirmComposition(const base::string16& text,
                                           const gfx::Range& replacement_range,
                                           bool keep_selection) {
  if (!ShouldHandleImeEvent())
    return;
  ImeEventGuard guard(this);
  handling_input_event_ = true;
  if (text.length())
    webwidget_->confirmComposition(text);
  else if (keep_selection)
    webwidget_->confirmComposition(WebWidget::KeepSelection);
  else
    webwidget_->confirmComposition(WebWidget::DoNotKeepSelection);
  handling_input_event_ = false;
#if defined(OS_MACOSX) || defined(OS_WIN) || defined(USE_AURA)
  UpdateCompositionInfo(true);
#endif
}

void RenderWidget::OnSnapshot(const gfx::Rect& src_subrect) {
  SkBitmap snapshot;

  if (OnSnapshotHelper(src_subrect, &snapshot)) {
    Send(new ViewHostMsg_Snapshot(routing_id(), true, snapshot));
  } else {
    Send(new ViewHostMsg_Snapshot(routing_id(), false, SkBitmap()));
  }
}

bool RenderWidget::OnSnapshotHelper(const gfx::Rect& src_subrect,
                                    SkBitmap* snapshot) {
  base::TimeTicks beginning_time = base::TimeTicks::Now();

  if (!webwidget_ || src_subrect.IsEmpty())
    return false;

  gfx::Rect viewport_size = gfx::IntersectRects(
      src_subrect, gfx::Rect(physical_backing_size_));

  skia::RefPtr<SkCanvas> canvas = skia::AdoptRef(
      skia::CreatePlatformCanvas(viewport_size.width(),
                                 viewport_size.height(),
                                 true,
                                 NULL,
                                 skia::RETURN_NULL_ON_FAILURE));
  if (!canvas)
    return false;

  canvas->save();
  webwidget_->layout();

  PaintRect(viewport_size, viewport_size.origin(), canvas.get());
  canvas->restore();

  const SkBitmap& bitmap = skia::GetTopDevice(*canvas)->accessBitmap(false);
  if (!bitmap.copyTo(snapshot, kPMColor_SkColorType))
    return false;

  UMA_HISTOGRAM_TIMES("Renderer4.Snapshot",
                      base::TimeTicks::Now() - beginning_time);
  return true;
}

void RenderWidget::OnRepaint(gfx::Size size_to_paint) {
  // During shutdown we can just ignore this message.
  if (!webwidget_)
    return;

  // Even if the browser provides an empty damage rect, it's still expecting to
  // receive a repaint ack so just damage the entire widget bounds.
  if (size_to_paint.IsEmpty()) {
    size_to_paint = size_;
  }

  set_next_paint_is_repaint_ack();
  if (is_accelerated_compositing_active_ && compositor_) {
    compositor_->SetNeedsRedrawRect(gfx::Rect(size_to_paint));
  } else {
    gfx::Rect repaint_rect(size_to_paint.width(), size_to_paint.height());
    didInvalidateRect(repaint_rect);
  }
}

void RenderWidget::OnSyntheticGestureCompleted() {
  DCHECK(!pending_synthetic_gesture_callbacks_.empty());

  pending_synthetic_gesture_callbacks_.front().Run();
  pending_synthetic_gesture_callbacks_.pop();
}

void RenderWidget::OnSetTextDirection(WebTextDirection direction) {
  if (!webwidget_)
    return;
  webwidget_->setTextDirection(direction);
}

void RenderWidget::OnUpdateScreenRects(const gfx::Rect& view_screen_rect,
                                       const gfx::Rect& window_screen_rect) {
  if (screen_metrics_emulator_) {
    screen_metrics_emulator_->OnUpdateScreenRectsMessage(
        view_screen_rect, window_screen_rect);
  } else {
    view_screen_rect_ = view_screen_rect;
    window_screen_rect_ = window_screen_rect;
  }
  Send(new ViewHostMsg_UpdateScreenRects_ACK(routing_id()));
}

#if defined(OS_ANDROID)
void RenderWidget::OnShowImeIfNeeded() {
  UpdateTextInputState(true, true);
}

void RenderWidget::IncrementOutstandingImeEventAcks() {
  ++outstanding_ime_acks_;
}

void RenderWidget::OnImeEventAck() {
  --outstanding_ime_acks_;
  DCHECK(outstanding_ime_acks_ >= 0);
}
#endif

bool RenderWidget::ShouldHandleImeEvent() {
#if defined(OS_ANDROID)
  return !!webwidget_ && outstanding_ime_acks_ == 0;
#else
  return !!webwidget_;
#endif
}

void RenderWidget::SetDeviceScaleFactor(float device_scale_factor) {
  if (device_scale_factor_ == device_scale_factor)
    return;

  device_scale_factor_ = device_scale_factor;

  if (!is_accelerated_compositing_active_) {
    didInvalidateRect(gfx::Rect(size_.width(), size_.height()));
  } else {
    scheduleComposite();
  }
}

PepperPluginInstanceImpl* RenderWidget::GetBitmapForOptimizedPluginPaint(
    const gfx::Rect& paint_bounds,
    TransportDIB** dib,
    gfx::Rect* location,
    gfx::Rect* clip,
    float* scale_factor) {
  // Bare RenderWidgets don't support optimized plugin painting.
  return NULL;
}

gfx::Vector2d RenderWidget::GetScrollOffset() {
  // Bare RenderWidgets don't support scroll offset.
  return gfx::Vector2d();
}

void RenderWidget::SetHidden(bool hidden) {
  if (is_hidden_ == hidden)
    return;

  // The status has changed.  Tell the RenderThread about it.
  is_hidden_ = hidden;
  if (is_hidden_)
    RenderThreadImpl::current()->WidgetHidden();
  else
    RenderThreadImpl::current()->WidgetRestored();
}

void RenderWidget::WillToggleFullscreen() {
  if (!webwidget_)
    return;

  if (is_fullscreen_) {
    webwidget_->willExitFullScreen();
  } else {
    webwidget_->willEnterFullScreen();
  }
}

void RenderWidget::DidToggleFullscreen() {
  if (!webwidget_)
    return;

  if (is_fullscreen_) {
    webwidget_->didEnterFullScreen();
  } else {
    webwidget_->didExitFullScreen();
  }
}

void RenderWidget::SetBackground(const SkBitmap& background) {
  background_ = background;

  // Generate a full repaint.
  didInvalidateRect(gfx::Rect(size_.width(), size_.height()));
}

bool RenderWidget::next_paint_is_resize_ack() const {
  return ViewHostMsg_UpdateRect_Flags::is_resize_ack(next_paint_flags_);
}

bool RenderWidget::next_paint_is_restore_ack() const {
  return ViewHostMsg_UpdateRect_Flags::is_restore_ack(next_paint_flags_);
}

void RenderWidget::set_next_paint_is_resize_ack() {
  next_paint_flags_ |= ViewHostMsg_UpdateRect_Flags::IS_RESIZE_ACK;
}

void RenderWidget::set_next_paint_is_restore_ack() {
  next_paint_flags_ |= ViewHostMsg_UpdateRect_Flags::IS_RESTORE_ACK;
}

void RenderWidget::set_next_paint_is_repaint_ack() {
  next_paint_flags_ |= ViewHostMsg_UpdateRect_Flags::IS_REPAINT_ACK;
}

static bool IsDateTimeInput(ui::TextInputType type) {
  return type == ui::TEXT_INPUT_TYPE_DATE ||
      type == ui::TEXT_INPUT_TYPE_DATE_TIME ||
      type == ui::TEXT_INPUT_TYPE_DATE_TIME_LOCAL ||
      type == ui::TEXT_INPUT_TYPE_MONTH ||
      type == ui::TEXT_INPUT_TYPE_TIME ||
      type == ui::TEXT_INPUT_TYPE_WEEK;
}


void RenderWidget::StartHandlingImeEvent() {
  DCHECK(!handling_ime_event_);
  handling_ime_event_ = true;
}

void RenderWidget::FinishHandlingImeEvent() {
  DCHECK(handling_ime_event_);
  handling_ime_event_ = false;
  // While handling an ime event, text input state and selection bounds updates
  // are ignored. These must explicitly be updated once finished handling the
  // ime event.
#if defined(OS_ANDROID)
  UpdateSelectionRootBounds();
#endif
  UpdateSelectionBounds();
#if defined(OS_ANDROID)
  UpdateTextInputState(false, false);
#endif
}

void RenderWidget::UpdateTextInputType() {
  // On Windows, not only an IME but also an on-screen keyboard relies on the
  // latest TextInputType to optimize its layout and functionality. Thus
  // |input_method_is_active_| is no longer an appropriate condition to suppress
  // TextInputTypeChanged IPC on Windows.
  // TODO(yukawa, yoichio): Consider to stop checking |input_method_is_active_|
  // on other platforms as well as Windows if the overhead is acceptable.
#if !defined(OS_WIN)
  if (!input_method_is_active_)
    return;
#endif

  ui::TextInputType new_type = GetTextInputType();
  if (IsDateTimeInput(new_type))
    return;  // Not considered as a text input field in WebKit/Chromium.

  bool new_can_compose_inline = CanComposeInline();

  blink::WebTextInputInfo new_info;
  if (webwidget_)
    new_info = webwidget_->textInputInfo();
  const ui::TextInputMode new_mode = ConvertInputMode(new_info.inputMode);

  if (text_input_type_ != new_type
      || can_compose_inline_ != new_can_compose_inline
      || text_input_mode_ != new_mode) {
    Send(new ViewHostMsg_TextInputTypeChanged(routing_id(),
                                              new_type,
                                              new_mode,
                                              new_can_compose_inline));
    text_input_type_ = new_type;
    can_compose_inline_ = new_can_compose_inline;
    text_input_mode_ = new_mode;
  }
}

#if defined(OS_ANDROID) || defined(USE_AURA)
void RenderWidget::UpdateTextInputState(bool show_ime_if_needed,
                                        bool send_ime_ack) {
  if (handling_ime_event_)
    return;
  if (!show_ime_if_needed && !input_method_is_active_)
    return;
  ui::TextInputType new_type = GetTextInputType();
  if (IsDateTimeInput(new_type))
    return;  // Not considered as a text input field in WebKit/Chromium.

  blink::WebTextInputInfo new_info;
  if (webwidget_)
    new_info = webwidget_->textInputInfo();

  bool new_can_compose_inline = CanComposeInline();

  // Only sends text input params if they are changed or if the ime should be
  // shown.
  if (show_ime_if_needed || (text_input_type_ != new_type
      || text_input_info_ != new_info
      || can_compose_inline_ != new_can_compose_inline)) {
    ViewHostMsg_TextInputState_Params p;
#if defined(USE_AURA)
    p.require_ack = false;
#endif
    p.type = new_type;
    p.value = new_info.value.utf8();
    p.selection_start = new_info.selectionStart;
    p.selection_end = new_info.selectionEnd;
    p.composition_start = new_info.compositionStart;
    p.composition_end = new_info.compositionEnd;
    p.can_compose_inline = new_can_compose_inline;
    p.show_ime_if_needed = show_ime_if_needed;
#if defined(OS_ANDROID)
    p.require_ack = send_ime_ack;
    if (p.require_ack)
      IncrementOutstandingImeEventAcks();
#endif
    Send(new ViewHostMsg_TextInputStateChanged(routing_id(), p));

    text_input_info_ = new_info;
    text_input_type_ = new_type;
    can_compose_inline_ = new_can_compose_inline;
  }
}
#endif

void RenderWidget::GetSelectionBounds(gfx::Rect* focus, gfx::Rect* anchor) {
  WebRect focus_webrect;
  WebRect anchor_webrect;
  webwidget_->selectionBounds(focus_webrect, anchor_webrect);
  *focus = focus_webrect;
  *anchor = anchor_webrect;
}

void RenderWidget::UpdateSelectionBounds() {
  if (!webwidget_)
    return;
  if (handling_ime_event_)
    return;

  ViewHostMsg_SelectionBounds_Params params;
  GetSelectionBounds(&params.anchor_rect, &params.focus_rect);
  if (selection_anchor_rect_ != params.anchor_rect ||
      selection_focus_rect_ != params.focus_rect) {
    selection_anchor_rect_ = params.anchor_rect;
    selection_focus_rect_ = params.focus_rect;
    webwidget_->selectionTextDirection(params.focus_dir, params.anchor_dir);
    params.is_anchor_first = webwidget_->isSelectionAnchorFirst();
    Send(new ViewHostMsg_SelectionBoundsChanged(routing_id_, params));
  }
#if defined(OS_MACOSX) || defined(OS_WIN) || defined(USE_AURA)
  UpdateCompositionInfo(false);
#endif
}

// Check blink::WebTextInputType and ui::TextInputType is kept in sync.
COMPILE_ASSERT(int(blink::WebTextInputTypeNone) == \
               int(ui::TEXT_INPUT_TYPE_NONE), mismatching_enums);
COMPILE_ASSERT(int(blink::WebTextInputTypeText) == \
               int(ui::TEXT_INPUT_TYPE_TEXT), mismatching_enums);
COMPILE_ASSERT(int(blink::WebTextInputTypePassword) == \
               int(ui::TEXT_INPUT_TYPE_PASSWORD), mismatching_enums);
COMPILE_ASSERT(int(blink::WebTextInputTypeSearch) == \
               int(ui::TEXT_INPUT_TYPE_SEARCH), mismatching_enums);
COMPILE_ASSERT(int(blink::WebTextInputTypeEmail) == \
               int(ui::TEXT_INPUT_TYPE_EMAIL), mismatching_enums);
COMPILE_ASSERT(int(blink::WebTextInputTypeNumber) == \
               int(ui::TEXT_INPUT_TYPE_NUMBER), mismatching_enums);
COMPILE_ASSERT(int(blink::WebTextInputTypeTelephone) == \
               int(ui::TEXT_INPUT_TYPE_TELEPHONE), mismatching_enums);
COMPILE_ASSERT(int(blink::WebTextInputTypeURL) == \
               int(ui::TEXT_INPUT_TYPE_URL), mismatching_enums);
COMPILE_ASSERT(int(blink::WebTextInputTypeDate) == \
               int(ui::TEXT_INPUT_TYPE_DATE), mismatching_enum);
COMPILE_ASSERT(int(blink::WebTextInputTypeDateTime) == \
               int(ui::TEXT_INPUT_TYPE_DATE_TIME), mismatching_enum);
COMPILE_ASSERT(int(blink::WebTextInputTypeDateTimeLocal) == \
               int(ui::TEXT_INPUT_TYPE_DATE_TIME_LOCAL), mismatching_enum);
COMPILE_ASSERT(int(blink::WebTextInputTypeMonth) == \
               int(ui::TEXT_INPUT_TYPE_MONTH), mismatching_enum);
COMPILE_ASSERT(int(blink::WebTextInputTypeTime) == \
               int(ui::TEXT_INPUT_TYPE_TIME), mismatching_enum);
COMPILE_ASSERT(int(blink::WebTextInputTypeWeek) == \
               int(ui::TEXT_INPUT_TYPE_WEEK), mismatching_enum);
COMPILE_ASSERT(int(blink::WebTextInputTypeTextArea) == \
               int(ui::TEXT_INPUT_TYPE_TEXT_AREA), mismatching_enums);
COMPILE_ASSERT(int(blink::WebTextInputTypeContentEditable) == \
               int(ui::TEXT_INPUT_TYPE_CONTENT_EDITABLE), mismatching_enums);
COMPILE_ASSERT(int(blink::WebTextInputTypeDateTimeField) == \
               int(ui::TEXT_INPUT_TYPE_DATE_TIME_FIELD), mismatching_enums);

ui::TextInputType RenderWidget::WebKitToUiTextInputType(
    blink::WebTextInputType type) {
  // Check the type is in the range representable by ui::TextInputType.
  DCHECK_LE(type, static_cast<int>(ui::TEXT_INPUT_TYPE_MAX)) <<
    "blink::WebTextInputType and ui::TextInputType not synchronized";
  return static_cast<ui::TextInputType>(type);
}

ui::TextInputType RenderWidget::GetTextInputType() {
  if (webwidget_)
    return WebKitToUiTextInputType(webwidget_->textInputInfo().type);
  return ui::TEXT_INPUT_TYPE_NONE;
}

#if defined(OS_MACOSX) || defined(OS_WIN) || defined(USE_AURA)
void RenderWidget::UpdateCompositionInfo(bool should_update_range) {
  gfx::Range range = gfx::Range();
  if (should_update_range) {
    GetCompositionRange(&range);
  } else {
    range = composition_range_;
  }
  std::vector<gfx::Rect> character_bounds;
  GetCompositionCharacterBounds(&character_bounds);

  if (!ShouldUpdateCompositionInfo(range, character_bounds))
    return;
  composition_character_bounds_ = character_bounds;
  composition_range_ = range;
  Send(new ViewHostMsg_ImeCompositionRangeChanged(
      routing_id(), composition_range_, composition_character_bounds_));
}

void RenderWidget::GetCompositionCharacterBounds(
    std::vector<gfx::Rect>* bounds) {
  DCHECK(bounds);
  bounds->clear();
}

void RenderWidget::GetCompositionRange(gfx::Range* range) {
  size_t location, length;
  if (webwidget_->compositionRange(&location, &length)) {
    range->set_start(location);
    range->set_end(location + length);
  } else if (webwidget_->caretOrSelectionRange(&location, &length)) {
    range->set_start(location);
    range->set_end(location + length);
  } else {
    *range = gfx::Range::InvalidRange();
  }
}

bool RenderWidget::ShouldUpdateCompositionInfo(
    const gfx::Range& range,
    const std::vector<gfx::Rect>& bounds) {
  if (composition_range_ != range)
    return true;
  if (bounds.size() != composition_character_bounds_.size())
    return true;
  for (size_t i = 0; i < bounds.size(); ++i) {
    if (bounds[i] != composition_character_bounds_[i])
      return true;
  }
  return false;
}
#endif

bool RenderWidget::CanComposeInline() {
  return true;
}

WebScreenInfo RenderWidget::screenInfo() {
  return screen_info_;
}

float RenderWidget::deviceScaleFactor() {
  return device_scale_factor_;
}

void RenderWidget::resetInputMethod() {
  if (!input_method_is_active_)
    return;

  ImeEventGuard guard(this);
  // If the last text input type is not None, then we should finish any
  // ongoing composition regardless of the new text input type.
  if (text_input_type_ != ui::TEXT_INPUT_TYPE_NONE) {
    // If a composition text exists, then we need to let the browser process
    // to cancel the input method's ongoing composition session.
    if (webwidget_->confirmComposition())
      Send(new ViewHostMsg_ImeCancelComposition(routing_id()));
  }

#if defined(OS_MACOSX) || defined(OS_WIN) || defined(USE_AURA)
  UpdateCompositionInfo(true);
#endif
}

void RenderWidget::didHandleGestureEvent(
    const WebGestureEvent& event,
    bool event_cancelled) {
#if defined(OS_ANDROID) || defined(USE_AURA)
  if (event_cancelled)
    return;
  if (event.type == WebInputEvent::GestureTap ||
      event.type == WebInputEvent::GestureLongPress) {
    UpdateTextInputState(true, true);
  }
#endif
}

void RenderWidget::SchedulePluginMove(const WebPluginGeometry& move) {
  size_t i = 0;
  for (; i < plugin_window_moves_.size(); ++i) {
    if (plugin_window_moves_[i].window == move.window) {
      if (move.rects_valid) {
        plugin_window_moves_[i] = move;
      } else {
        plugin_window_moves_[i].visible = move.visible;
      }
      break;
    }
  }

  if (i == plugin_window_moves_.size())
    plugin_window_moves_.push_back(move);
}

void RenderWidget::CleanupWindowInPluginMoves(gfx::PluginWindowHandle window) {
  for (WebPluginGeometryVector::iterator i = plugin_window_moves_.begin();
       i != plugin_window_moves_.end(); ++i) {
    if (i->window == window) {
      plugin_window_moves_.erase(i);
      break;
    }
  }
}


RenderWidgetCompositor* RenderWidget::compositor() const {
  return compositor_.get();
}

bool RenderWidget::WillHandleMouseEvent(const blink::WebMouseEvent& event) {
  return false;
}

bool RenderWidget::WillHandleGestureEvent(
    const blink::WebGestureEvent& event) {
  return false;
}

void RenderWidget::hasTouchEventHandlers(bool has_handlers) {
  Send(new ViewHostMsg_HasTouchEventHandlers(routing_id_, has_handlers));
}

void RenderWidget::setTouchAction(
    blink::WebTouchAction web_touch_action) {

  // Ignore setTouchAction calls that result from synthetic touch events (eg.
  // when blink is emulating touch with mouse).
  if (!handling_touchstart_event_)
    return;

   // Verify the same values are used by the types so we can cast between them.
   COMPILE_ASSERT(static_cast<blink::WebTouchAction>(TOUCH_ACTION_AUTO) ==
                      blink::WebTouchActionAuto,
                  enum_values_must_match_for_touch_action);
   COMPILE_ASSERT(static_cast<blink::WebTouchAction>(TOUCH_ACTION_NONE) ==
                      blink::WebTouchActionNone,
                  enum_values_must_match_for_touch_action);
   COMPILE_ASSERT(static_cast<blink::WebTouchAction>(TOUCH_ACTION_PAN_X) ==
                      blink::WebTouchActionPanX,
                  enum_values_must_match_for_touch_action);
   COMPILE_ASSERT(static_cast<blink::WebTouchAction>(TOUCH_ACTION_PAN_Y) ==
                      blink::WebTouchActionPanY,
                  enum_values_must_match_for_touch_action);
   COMPILE_ASSERT(
       static_cast<blink::WebTouchAction>(TOUCH_ACTION_PINCH_ZOOM) ==
           blink::WebTouchActionPinchZoom,
       enum_values_must_match_for_touch_action);

   content::TouchAction content_touch_action =
       static_cast<content::TouchAction>(web_touch_action);
  Send(new InputHostMsg_SetTouchAction(routing_id_, content_touch_action));
}

#if defined(OS_ANDROID)
void RenderWidget::UpdateSelectionRootBounds() {
}
#endif

bool RenderWidget::HasTouchEventHandlersAt(const gfx::Point& point) const {
  return true;
}

scoped_ptr<WebGraphicsContext3DCommandBufferImpl>
RenderWidget::CreateGraphicsContext3D() {
  if (!webwidget_)
    return scoped_ptr<WebGraphicsContext3DCommandBufferImpl>();
  if (CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kDisableGpuCompositing))
    return scoped_ptr<WebGraphicsContext3DCommandBufferImpl>();
  if (!RenderThreadImpl::current())
    return scoped_ptr<WebGraphicsContext3DCommandBufferImpl>();
  CauseForGpuLaunch cause =
      CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE;
  scoped_refptr<GpuChannelHost> gpu_channel_host(
      RenderThreadImpl::current()->EstablishGpuChannelSync(cause));
  if (!gpu_channel_host)
    return scoped_ptr<WebGraphicsContext3DCommandBufferImpl>();

  // Explicitly disable antialiasing for the compositor. As of the time of
  // this writing, the only platform that supported antialiasing for the
  // compositor was Mac OS X, because the on-screen OpenGL context creation
  // code paths on Windows and Linux didn't yet have multisampling support.
  // Mac OS X essentially always behaves as though it's rendering offscreen.
  // Multisampling has a heavy cost especially on devices with relatively low
  // fill rate like most notebooks, and the Mac implementation would need to
  // be optimized to resolve directly into the IOSurface shared between the
  // GPU and browser processes. For these reasons and to avoid platform
  // disparities we explicitly disable antialiasing.
  blink::WebGraphicsContext3D::Attributes attributes;
  attributes.antialias = false;
  attributes.shareResources = true;
  attributes.noAutomaticFlushes = true;
  attributes.depth = false;
  attributes.stencil = false;
  bool lose_context_when_out_of_memory = true;
  WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits limits;
#if defined(OS_ANDROID)
  // If we raster too fast we become upload bound, and pending
  // uploads consume memory. For maximum upload throughput, we would
  // want to allow for upload_throughput * pipeline_time of pending
  // uploads, after which we are just wasting memory. Since we don't
  // know our upload throughput yet, this just caps our memory usage.
  size_t divider = 1;
  if (base::android::SysUtils::IsLowEndDevice())
    divider = 6;
  // For reference Nexus10 can upload 1MB in about 2.5ms.
  const double max_mb_uploaded_per_ms = 2.0 / (5 * divider);
  // Deadline to draw a frame to achieve 60 frames per second.
  const size_t kMillisecondsPerFrame = 16;
  // Assuming a two frame deep pipeline between the CPU and the GPU.
  size_t max_transfer_buffer_usage_mb =
      static_cast<size_t>(2 * kMillisecondsPerFrame * max_mb_uploaded_per_ms);
  static const size_t kBytesPerMegabyte = 1024 * 1024;
  // We keep the MappedMemoryReclaimLimit the same as the upload limit
  // to avoid unnecessarily stalling the compositor thread.
  limits.mapped_memory_reclaim_limit =
      max_transfer_buffer_usage_mb * kBytesPerMegabyte;
#endif

  scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context(
      new WebGraphicsContext3DCommandBufferImpl(surface_id(),
                                                GetURLForGraphicsContext3D(),
                                                gpu_channel_host.get(),
                                                attributes,
                                                lose_context_when_out_of_memory,
                                                limits,
                                                NULL));
  return context.Pass();
}

void RenderWidget::RegisterSwappedOutChildFrame(RenderFrameImpl* frame) {
  swapped_out_frames_.AddObserver(frame);
}

void RenderWidget::UnregisterSwappedOutChildFrame(RenderFrameImpl* frame) {
  swapped_out_frames_.RemoveObserver(frame);
}

}  // namespace content
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root/content/renderer/render_widget.cc

DEFINITIONS
