root/content/browser/renderer_host/render_widget_host_impl.cc

DEFINITIONS

1. GetInputRouterViewFlagsFromCompositorFrameMetadata
2. Add
3. GetNextHost
4. BackingStoreMemorySize
5. last_input_number_
6. FromID
7. FromID
8. GetRenderWidgetHosts
9. GetAllRenderWidgetHosts
10. From
11. SetView
12. GetProcess
13. GetRoutingID
14. GetView
15. AsRenderWidgetHostImpl
16. GetNativeViewId
17. GetCompositingSurface
18. ResetSizeAndRepaintPendingFlags
19. SendScreenRects
20. SetOverscrollControllerEnabled
21. SuppressNextCharEvents
22. FlushInput
23. SetNeedsFlush
24. Init
25. Shutdown
26. IsLoading
27. IsRenderView
28. OnMessageReceived
29. Send
30. WasHidden
31. WasShown
32. WasResized
33. ResizeRectChanged
34. GotFocus
35. Focus
36. Blur
37. LostCapture
38. SetActive
39. LostMouseLock
40. ViewDestroyed
41. SetIsLoading
42. CopyFromBackingStore
43. CanCopyFromBackingStore
44. LockBackingStore
45. UnlockBackingStore
46. CopyFromBackingStoreToGtkWindow
47. GetBackingStoreSize
48. CopyFromBackingStoreToCGContext
49. PauseForPendingResizeOrRepaints
50. TryGetBackingStore
51. GetBackingStore
52. AllocBackingStore
53. DonePaintingToBackingStore
54. ScheduleComposite
55. StartHangMonitorTimeout
56. RestartHangMonitorTimeout
57. StopHangMonitorTimeout
58. EnableFullAccessibilityMode
59. IsFullAccessibilityModeForTesting
60. EnableTreeOnlyAccessibilityMode
61. IsTreeOnlyAccessibilityModeForTesting
62. ForwardMouseEvent
63. ForwardMouseEventWithLatencyInfo
64. OnPointerEventActivate
65. ForwardWheelEvent
66. ForwardWheelEventWithLatencyInfo
67. ForwardGestureEvent
68. ForwardGestureEventWithLatencyInfo
69. ForwardTouchEventWithLatencyInfo
70. ForwardKeyboardEvent
71. QueueSyntheticGesture
72. SendCursorVisibilityState
73. GetLatencyComponentId
74. DisableResizeAckCheckForTesting
75. CreateRWHLatencyInfoIfNotExist
76. AddKeyPressEventCallback
77. RemoveKeyPressEventCallback
78. AddMouseEventCallback
79. RemoveMouseEventCallback
80. GetWebScreenInfo
81. GetLastKeyboardEvent
82. NotifyScreenInfoChanged
83. InvalidateScreenInfo
84. GetSnapshotFromRenderer
85. OnSelectionChanged
86. OnSelectionBoundsChanged
87. OnSnapshot
88. UpdateVSyncParameters
89. RendererExited
90. UpdateTextDirection
91. CancelUpdateTextDirection
92. NotifyTextDirection
93. SetInputMethodActive
94. CandidateWindowShown
95. CandidateWindowUpdated
96. CandidateWindowHidden
97. ImeSetComposition
98. ImeConfirmComposition
99. ImeCancelComposition
100. GetRootWindowResizerRect
101. RequestToLockMouse
102. RejectMouseLockOrUnlockIfNecessary
103. IsMouseLocked
104. IsFullscreen
105. SetShouldAutoResize
106. Destroy
107. RendererIsUnresponsive
108. RendererIsResponsive
109. OnRenderViewReady
110. OnRenderProcessGone
111. OnClose
112. OnSetTooltipText
113. OnUpdateScreenRectsAck
114. OnRequestMove
115. OnCompositorSurfaceBuffersSwapped
116. OnSwapCompositorFrame
117. OnOverscrolled
118. OnFlingingStopped
119. OnUpdateRect
120. OnUpdateIsDelayed
121. DidUpdateBackingStore
122. OnQueueSyntheticGesture
123. OnFocus
124. OnBlur
125. OnSetCursor
126. OnTextInputTypeChanged
127. OnImeCompositionRangeChanged
128. OnImeCancelComposition
129. OnDidActivateAcceleratedCompositing
130. OnLockMouse
131. OnUnlockMouse
132. OnShowDisambiguationPopup
133. OnWindowlessPluginDummyWindowCreated
134. OnWindowlessPluginDummyWindowDestroyed
135. PaintBackingStoreRect
136. ScrollBackingStoreRect
137. SetIgnoreInputEvents
138. KeyPressListenersHandleEvent
139. FilterInputEvent
140. IncrementInFlightEventCount
141. DecrementInFlightEventCount
142. OnHasTouchEventHandlers
143. GetOverscrollController
144. DidFlush
145. OnKeyboardEventAck
146. OnWheelEventAck
147. OnGestureEventAck
148. OnTouchEventAck
149. OnUnexpectedEventAck
150. OnSyntheticGestureCompleted
151. GetLastScrollOffset
152. IgnoreInputEvents
153. ShouldForwardTouchEvent
154. StartUserGesture
155. Stop
156. SetBackground
157. SetEditCommandsForNextKeyEvent
158. AddAccessibilityMode
159. RemoveAccessibilityMode
160. ResetAccessibilityMode
161. SetAccessibilityMode
162. AccessibilityDoDefaultAction
163. AccessibilitySetFocus
164. AccessibilityScrollToMakeVisible
165. AccessibilityScrollToPoint
166. AccessibilitySetTextSelection
167. FatalAccessibilityTreeError
168. SetParentNativeViewAccessible
169. GetParentNativeViewAccessible
170. ExecuteEditCommand
171. ScrollFocusedEditableNodeIntoRect
172. MoveCaret
173. GotResponseToLockMouseRequest
174. AcknowledgeBufferPresent
175. SendSwapCompositorFrameAck
176. SendReclaimCompositorResources
177. AcknowledgeSwapBuffersToRenderer
178. DelayedAutoResized
179. DetachDelegate
180. ComputeTouchLatency
181. FrameSwapped
182. DidReceiveRendererFrame
183. WindowSnapshotAsyncCallback
184. WindowSnapshotReachedScreen
185. CompositorFrameDrawn
186. AddLatencyInfoComponentIds
187. PreferredReadbackFormat

// 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/browser/renderer_host/render_widget_host_impl.h"

#include <math.h>
#include <set>
#include <utility>

#include "base/auto_reset.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/containers/hash_tables.h"
#include "base/debug/trace_event.h"
#include "base/i18n/rtl.h"
#include "base/lazy_instance.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/field_trial.h"
#include "base/metrics/histogram.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/thread_task_runner_handle.h"
#include "cc/base/switches.h"
#include "cc/output/compositor_frame.h"
#include "cc/output/compositor_frame_ack.h"
#include "content/browser/accessibility/accessibility_mode_helper.h"
#include "content/browser/accessibility/browser_accessibility_state_impl.h"
#include "content/browser/gpu/compositor_util.h"
#include "content/browser/gpu/gpu_process_host.h"
#include "content/browser/gpu/gpu_process_host_ui_shim.h"
#include "content/browser/gpu/gpu_surface_tracker.h"
#include "content/browser/renderer_host/backing_store.h"
#include "content/browser/renderer_host/backing_store_manager.h"
#include "content/browser/renderer_host/dip_util.h"
#include "content/browser/renderer_host/input/input_router_impl.h"
#include "content/browser/renderer_host/input/synthetic_gesture.h"
#include "content/browser/renderer_host/input/synthetic_gesture_controller.h"
#include "content/browser/renderer_host/input/synthetic_gesture_target.h"
#include "content/browser/renderer_host/input/timeout_monitor.h"
#include "content/browser/renderer_host/overscroll_controller.h"
#include "content/browser/renderer_host/render_process_host_impl.h"
#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/browser/renderer_host/render_widget_helper.h"
#include "content/browser/renderer_host/render_widget_host_delegate.h"
#include "content/common/accessibility_messages.h"
#include "content/common/content_constants_internal.h"
#include "content/common/cursors/webcursor.h"
#include "content/common/gpu/gpu_messages.h"
#include "content/common/input_messages.h"
#include "content/common/view_messages.h"
#include "content/port/browser/render_widget_host_view_port.h"
#include "content/public/browser/native_web_keyboard_event.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_types.h"
#include "content/public/browser/render_widget_host_iterator.h"
#include "content/public/browser/user_metrics.h"
#include "content/public/common/content_constants.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/result_codes.h"
#include "skia/ext/image_operations.h"
#include "skia/ext/platform_canvas.h"
#include "third_party/WebKit/public/web/WebCompositionUnderline.h"
#include "ui/events/event.h"
#include "ui/events/keycodes/keyboard_codes.h"
#include "ui/gfx/size_conversions.h"
#include "ui/gfx/skbitmap_operations.h"
#include "ui/gfx/vector2d_conversions.h"
#include "ui/snapshot/snapshot.h"
#include "webkit/common/webpreferences.h"

#if defined(TOOLKIT_GTK)
#include "content/browser/renderer_host/backing_store_gtk.h"
#elif defined(OS_MACOSX)
#include "content/browser/renderer_host/backing_store_mac.h"
#elif defined(OS_WIN)
#include "content/common/plugin_constants_win.h"
#endif

using base::Time;
using base::TimeDelta;
using base::TimeTicks;
using blink::WebGestureEvent;
using blink::WebInputEvent;
using blink::WebKeyboardEvent;
using blink::WebMouseEvent;
using blink::WebMouseWheelEvent;
using blink::WebTextDirection;

namespace content {
namespace {

bool g_check_for_pending_resize_ack = true;

// How long to (synchronously) wait for the renderer to respond with a
// PaintRect message, when our backing-store is invalid, before giving up and
// returning a null or incorrectly sized backing-store from GetBackingStore.
// This timeout impacts the "choppiness" of our window resize perf.
const int kPaintMsgTimeoutMS = 50;

typedef std::pair<int32, int32> RenderWidgetHostID;
typedef base::hash_map<RenderWidgetHostID, RenderWidgetHostImpl*>
    RoutingIDWidgetMap;
base::LazyInstance<RoutingIDWidgetMap> g_routing_id_widget_map =
    LAZY_INSTANCE_INITIALIZER;

int GetInputRouterViewFlagsFromCompositorFrameMetadata(
    const cc::CompositorFrameMetadata metadata) {
  int view_flags = InputRouter::VIEW_FLAGS_NONE;

  if (metadata.min_page_scale_factor == metadata.max_page_scale_factor)
    view_flags |= InputRouter::FIXED_PAGE_SCALE;

  const float window_width_dip =
      std::ceil(metadata.page_scale_factor * metadata.viewport_size.width());
  const float content_width_css = metadata.root_layer_size.width();
  if (content_width_css <= window_width_dip)
    view_flags |= InputRouter::MOBILE_VIEWPORT;

  return view_flags;
}

// Implements the RenderWidgetHostIterator interface. It keeps a list of
// RenderWidgetHosts, and makes sure it returns a live RenderWidgetHost at each
// iteration (or NULL if there isn't any left).
class RenderWidgetHostIteratorImpl : public RenderWidgetHostIterator {
 public:
  RenderWidgetHostIteratorImpl()
      : current_index_(0) {
  }

  virtual ~RenderWidgetHostIteratorImpl() {
  }

  void Add(RenderWidgetHost* host) {
    hosts_.push_back(RenderWidgetHostID(host->GetProcess()->GetID(),
                                        host->GetRoutingID()));
  }

  // RenderWidgetHostIterator:
  virtual RenderWidgetHost* GetNextHost() OVERRIDE {
    RenderWidgetHost* host = NULL;
    while (current_index_ < hosts_.size() && !host) {
      RenderWidgetHostID id = hosts_[current_index_];
      host = RenderWidgetHost::FromID(id.first, id.second);
      ++current_index_;
    }
    return host;
  }

 private:
  std::vector<RenderWidgetHostID> hosts_;
  size_t current_index_;

  DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostIteratorImpl);
};

}  // namespace


// static
size_t RenderWidgetHost::BackingStoreMemorySize() {
  return BackingStoreManager::MemorySize();
}

///////////////////////////////////////////////////////////////////////////////
// RenderWidgetHostImpl

RenderWidgetHostImpl::RenderWidgetHostImpl(RenderWidgetHostDelegate* delegate,
                                           RenderProcessHost* process,
                                           int routing_id,
                                           bool hidden)
    : view_(NULL),
      renderer_initialized_(false),
      hung_renderer_delay_ms_(kHungRendererDelayMs),
      delegate_(delegate),
      process_(process),
      routing_id_(routing_id),
      surface_id_(0),
      is_loading_(false),
      is_hidden_(hidden),
      is_fullscreen_(false),
      is_accelerated_compositing_active_(false),
      repaint_ack_pending_(false),
      resize_ack_pending_(false),
      screen_info_out_of_date_(false),
      overdraw_bottom_height_(0.f),
      should_auto_resize_(false),
      waiting_for_screen_rects_ack_(false),
      accessibility_mode_(AccessibilityModeOff),
      needs_repainting_on_restore_(false),
      is_unresponsive_(false),
      in_flight_event_count_(0),
      in_get_backing_store_(false),
      abort_get_backing_store_(false),
      view_being_painted_(false),
      ignore_input_events_(false),
      input_method_active_(false),
      text_direction_updated_(false),
      text_direction_(blink::WebTextDirectionLeftToRight),
      text_direction_canceled_(false),
      suppress_next_char_events_(false),
      pending_mouse_lock_request_(false),
      allow_privileged_mouse_lock_(false),
      has_touch_handler_(false),
      weak_factory_(this),
      last_input_number_(static_cast<int64>(GetProcess()->GetID()) << 32) {
  CHECK(delegate_);
  if (routing_id_ == MSG_ROUTING_NONE) {
    routing_id_ = process_->GetNextRoutingID();
    surface_id_ = GpuSurfaceTracker::Get()->AddSurfaceForRenderer(
        process_->GetID(),
        routing_id_);
  } else {
    // TODO(piman): This is a O(N) lookup, where we could forward the
    // information from the RenderWidgetHelper. The problem is that doing so
    // currently leaks outside of content all the way to chrome classes, and
    // would be a layering violation. Since we don't expect more than a few
    // hundreds of RWH, this seems acceptable. Revisit if performance become a
    // problem, for example by tracking in the RenderWidgetHelper the routing id
    // (and surface id) that have been created, but whose RWH haven't yet.
    surface_id_ = GpuSurfaceTracker::Get()->LookupSurfaceForRenderer(
        process_->GetID(),
        routing_id_);
    DCHECK(surface_id_);
  }

  is_threaded_compositing_enabled_ = IsThreadedCompositingEnabled();

  std::pair<RoutingIDWidgetMap::iterator, bool> result =
      g_routing_id_widget_map.Get().insert(std::make_pair(
          RenderWidgetHostID(process->GetID(), routing_id_), this));
  CHECK(result.second) << "Inserting a duplicate item!";
  process_->AddRoute(routing_id_, this);

  // If we're initially visible, tell the process host that we're alive.
  // Otherwise we'll notify the process host when we are first shown.
  if (!hidden)
    process_->WidgetRestored();

  accessibility_mode_ =
      BrowserAccessibilityStateImpl::GetInstance()->accessibility_mode();

  input_router_.reset(new InputRouterImpl(process_, this, this, routing_id_));

#if defined(USE_AURA)
  bool overscroll_enabled = CommandLine::ForCurrentProcess()->
      GetSwitchValueASCII(switches::kOverscrollHistoryNavigation) != "0";
  SetOverscrollControllerEnabled(overscroll_enabled);
#endif

  if (GetProcess()->IsGuest() || !CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kDisableHangMonitor)) {
    hang_monitor_timeout_.reset(new TimeoutMonitor(
        base::Bind(&RenderWidgetHostImpl::RendererIsUnresponsive,
                   weak_factory_.GetWeakPtr())));
  }
}

RenderWidgetHostImpl::~RenderWidgetHostImpl() {
  SetView(NULL);

  // Clear our current or cached backing store if either remains.
  BackingStoreManager::RemoveBackingStore(this);

  GpuSurfaceTracker::Get()->RemoveSurface(surface_id_);
  surface_id_ = 0;

  process_->RemoveRoute(routing_id_);
  g_routing_id_widget_map.Get().erase(
      RenderWidgetHostID(process_->GetID(), routing_id_));

  if (delegate_)
    delegate_->RenderWidgetDeleted(this);
}

// static
RenderWidgetHost* RenderWidgetHost::FromID(
    int32 process_id,
    int32 routing_id) {
  return RenderWidgetHostImpl::FromID(process_id, routing_id);
}

// static
RenderWidgetHostImpl* RenderWidgetHostImpl::FromID(
    int32 process_id,
    int32 routing_id) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  RoutingIDWidgetMap* widgets = g_routing_id_widget_map.Pointer();
  RoutingIDWidgetMap::iterator it = widgets->find(
      RenderWidgetHostID(process_id, routing_id));
  return it == widgets->end() ? NULL : it->second;
}

// static
scoped_ptr<RenderWidgetHostIterator> RenderWidgetHost::GetRenderWidgetHosts() {
  RenderWidgetHostIteratorImpl* hosts = new RenderWidgetHostIteratorImpl();
  RoutingIDWidgetMap* widgets = g_routing_id_widget_map.Pointer();
  for (RoutingIDWidgetMap::const_iterator it = widgets->begin();
       it != widgets->end();
       ++it) {
    RenderWidgetHost* widget = it->second;

    if (!widget->IsRenderView()) {
      hosts->Add(widget);
      continue;
    }

    // Add only active RenderViewHosts.
    RenderViewHost* rvh = RenderViewHost::From(widget);
    if (RenderViewHostImpl::IsRVHStateActive(
            static_cast<RenderViewHostImpl*>(rvh)->rvh_state()))
      hosts->Add(widget);
  }

  return scoped_ptr<RenderWidgetHostIterator>(hosts);
}

// static
scoped_ptr<RenderWidgetHostIterator>
RenderWidgetHostImpl::GetAllRenderWidgetHosts() {
  RenderWidgetHostIteratorImpl* hosts = new RenderWidgetHostIteratorImpl();
  RoutingIDWidgetMap* widgets = g_routing_id_widget_map.Pointer();
  for (RoutingIDWidgetMap::const_iterator it = widgets->begin();
       it != widgets->end();
       ++it) {
    hosts->Add(it->second);
  }

  return scoped_ptr<RenderWidgetHostIterator>(hosts);
}

// static
RenderWidgetHostImpl* RenderWidgetHostImpl::From(RenderWidgetHost* rwh) {
  return rwh->AsRenderWidgetHostImpl();
}

void RenderWidgetHostImpl::SetView(RenderWidgetHostView* view) {
  view_ = RenderWidgetHostViewPort::FromRWHV(view);

  GpuSurfaceTracker::Get()->SetSurfaceHandle(
      surface_id_, GetCompositingSurface());

  synthetic_gesture_controller_.reset();
}

RenderProcessHost* RenderWidgetHostImpl::GetProcess() const {
  return process_;
}

int RenderWidgetHostImpl::GetRoutingID() const {
  return routing_id_;
}

RenderWidgetHostView* RenderWidgetHostImpl::GetView() const {
  return view_;
}

RenderWidgetHostImpl* RenderWidgetHostImpl::AsRenderWidgetHostImpl() {
  return this;
}

gfx::NativeViewId RenderWidgetHostImpl::GetNativeViewId() const {
  if (view_)
    return view_->GetNativeViewId();
  return 0;
}

gfx::GLSurfaceHandle RenderWidgetHostImpl::GetCompositingSurface() {
  if (view_)
    return view_->GetCompositingSurface();
  return gfx::GLSurfaceHandle();
}

void RenderWidgetHostImpl::ResetSizeAndRepaintPendingFlags() {
  resize_ack_pending_ = false;
  if (repaint_ack_pending_) {
    TRACE_EVENT_ASYNC_END0(
        "renderer_host", "RenderWidgetHostImpl::repaint_ack_pending_", this);
  }
  repaint_ack_pending_ = false;
  last_requested_size_.SetSize(0, 0);
}

void RenderWidgetHostImpl::SendScreenRects() {
  if (!renderer_initialized_ || waiting_for_screen_rects_ack_)
    return;

  if (is_hidden_) {
    // On GTK, this comes in for backgrounded tabs. Ignore, to match what
    // happens on Win & Mac, and when the view is shown it'll call this again.
    return;
  }

  if (!view_)
    return;

  last_view_screen_rect_ = view_->GetViewBounds();
  last_window_screen_rect_ = view_->GetBoundsInRootWindow();
  Send(new ViewMsg_UpdateScreenRects(
      GetRoutingID(), last_view_screen_rect_, last_window_screen_rect_));
  if (delegate_)
    delegate_->DidSendScreenRects(this);
  waiting_for_screen_rects_ack_ = true;
}

void RenderWidgetHostImpl::SetOverscrollControllerEnabled(bool enabled) {
  if (!enabled)
    overscroll_controller_.reset();
  else if (!overscroll_controller_)
    overscroll_controller_.reset(new OverscrollController());
}

void RenderWidgetHostImpl::SuppressNextCharEvents() {
  suppress_next_char_events_ = true;
}

void RenderWidgetHostImpl::FlushInput() {
  input_router_->Flush();
  if (synthetic_gesture_controller_)
    synthetic_gesture_controller_->Flush(base::TimeTicks::Now());
}

void RenderWidgetHostImpl::SetNeedsFlush() {
  if (view_)
    view_->OnSetNeedsFlushInput();
}

void RenderWidgetHostImpl::Init() {
  DCHECK(process_->HasConnection());

  renderer_initialized_ = true;

  GpuSurfaceTracker::Get()->SetSurfaceHandle(
      surface_id_, GetCompositingSurface());

  // Send the ack along with the information on placement.
  Send(new ViewMsg_CreatingNew_ACK(routing_id_));
  GetProcess()->ResumeRequestsForView(routing_id_);

  WasResized();
}

void RenderWidgetHostImpl::Shutdown() {
  RejectMouseLockOrUnlockIfNecessary();

  if (process_->HasConnection()) {
    // Tell the renderer object to close.
    bool rv = Send(new ViewMsg_Close(routing_id_));
    DCHECK(rv);
  }

  Destroy();
}

bool RenderWidgetHostImpl::IsLoading() const {
  return is_loading_;
}

bool RenderWidgetHostImpl::IsRenderView() const {
  return false;
}

bool RenderWidgetHostImpl::OnMessageReceived(const IPC::Message &msg) {
  bool handled = true;
  bool msg_is_ok = true;
  IPC_BEGIN_MESSAGE_MAP_EX(RenderWidgetHostImpl, msg, msg_is_ok)
    IPC_MESSAGE_HANDLER(InputHostMsg_QueueSyntheticGesture,
                        OnQueueSyntheticGesture)
    IPC_MESSAGE_HANDLER(ViewHostMsg_RenderViewReady, OnRenderViewReady)
    IPC_MESSAGE_HANDLER(ViewHostMsg_RenderProcessGone, OnRenderProcessGone)
    IPC_MESSAGE_HANDLER(ViewHostMsg_Close, OnClose)
    IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateScreenRects_ACK,
                        OnUpdateScreenRectsAck)
    IPC_MESSAGE_HANDLER(ViewHostMsg_RequestMove, OnRequestMove)
    IPC_MESSAGE_HANDLER(ViewHostMsg_SetTooltipText, OnSetTooltipText)
    IPC_MESSAGE_HANDLER_GENERIC(ViewHostMsg_SwapCompositorFrame,
                                msg_is_ok = OnSwapCompositorFrame(msg))
    IPC_MESSAGE_HANDLER(ViewHostMsg_DidOverscroll, OnOverscrolled)
    IPC_MESSAGE_HANDLER(ViewHostMsg_DidStopFlinging, OnFlingingStopped)
    IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateRect, OnUpdateRect)
    IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateIsDelayed, OnUpdateIsDelayed)
    IPC_MESSAGE_HANDLER(ViewHostMsg_Focus, OnFocus)
    IPC_MESSAGE_HANDLER(ViewHostMsg_Blur, OnBlur)
    IPC_MESSAGE_HANDLER(ViewHostMsg_SetCursor, OnSetCursor)
    IPC_MESSAGE_HANDLER(ViewHostMsg_TextInputTypeChanged,
                        OnTextInputTypeChanged)
    IPC_MESSAGE_HANDLER(ViewHostMsg_ImeCancelComposition,
                        OnImeCancelComposition)
    IPC_MESSAGE_HANDLER(ViewHostMsg_DidActivateAcceleratedCompositing,
                        OnDidActivateAcceleratedCompositing)
    IPC_MESSAGE_HANDLER(ViewHostMsg_LockMouse, OnLockMouse)
    IPC_MESSAGE_HANDLER(ViewHostMsg_UnlockMouse, OnUnlockMouse)
    IPC_MESSAGE_HANDLER(ViewHostMsg_ShowDisambiguationPopup,
                        OnShowDisambiguationPopup)
    IPC_MESSAGE_HANDLER(ViewHostMsg_SelectionChanged, OnSelectionChanged)
    IPC_MESSAGE_HANDLER(ViewHostMsg_SelectionBoundsChanged,
                        OnSelectionBoundsChanged)
    IPC_MESSAGE_HANDLER(ViewHostMsg_Snapshot, OnSnapshot)
#if defined(OS_WIN)
    IPC_MESSAGE_HANDLER(ViewHostMsg_WindowlessPluginDummyWindowCreated,
                        OnWindowlessPluginDummyWindowCreated)
    IPC_MESSAGE_HANDLER(ViewHostMsg_WindowlessPluginDummyWindowDestroyed,
                        OnWindowlessPluginDummyWindowDestroyed)
#endif
#if defined(OS_MACOSX)
    IPC_MESSAGE_HANDLER(ViewHostMsg_CompositorSurfaceBuffersSwapped,
                        OnCompositorSurfaceBuffersSwapped)
#endif
#if defined(OS_MACOSX) || defined(OS_WIN) || defined(USE_AURA)
    IPC_MESSAGE_HANDLER(ViewHostMsg_ImeCompositionRangeChanged,
                        OnImeCompositionRangeChanged)
#endif
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP_EX()

  if (!handled && input_router_ && input_router_->OnMessageReceived(msg))
    return true;

  if (!handled && view_ && view_->OnMessageReceived(msg))
    return true;

  if (!msg_is_ok) {
    // The message de-serialization failed. Kill the renderer process.
    RecordAction(base::UserMetricsAction("BadMessageTerminate_RWH"));
    GetProcess()->ReceivedBadMessage();
  }
  return handled;
}

bool RenderWidgetHostImpl::Send(IPC::Message* msg) {
  if (IPC_MESSAGE_ID_CLASS(msg->type()) == InputMsgStart)
    return input_router_->SendInput(make_scoped_ptr(msg));

  return process_->Send(msg);
}

void RenderWidgetHostImpl::WasHidden() {
  if (is_hidden_)
    return;

  is_hidden_ = true;

  // Don't bother reporting hung state when we aren't active.
  StopHangMonitorTimeout();

  // If we have a renderer, then inform it that we are being hidden so it can
  // reduce its resource utilization.
  Send(new ViewMsg_WasHidden(routing_id_));

  // Tell the RenderProcessHost we were hidden.
  process_->WidgetHidden();

  bool is_visible = false;
  NotificationService::current()->Notify(
      NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED,
      Source<RenderWidgetHost>(this),
      Details<bool>(&is_visible));
}

void RenderWidgetHostImpl::WasShown() {
  if (!is_hidden_)
    return;
  is_hidden_ = false;

  SendScreenRects();

  BackingStore* backing_store = BackingStoreManager::Lookup(this);
  // If we already have a backing store for this widget, then we don't need to
  // repaint on restore _unless_ we know that our backing store is invalid.
  // When accelerated compositing is on, we must always repaint, even when
  // the backing store exists.
  bool needs_repainting;
  if (needs_repainting_on_restore_ || !backing_store ||
      is_accelerated_compositing_active()) {
    needs_repainting = true;
    needs_repainting_on_restore_ = false;
  } else {
    needs_repainting = false;
  }
  Send(new ViewMsg_WasShown(routing_id_, needs_repainting));

  process_->WidgetRestored();

  bool is_visible = true;
  NotificationService::current()->Notify(
      NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED,
      Source<RenderWidgetHost>(this),
      Details<bool>(&is_visible));

  // It's possible for our size to be out of sync with the renderer. The
  // following is one case that leads to this:
  // 1. WasResized -> Send ViewMsg_Resize to render
  // 2. WasResized -> do nothing as resize_ack_pending_ is true
  // 3. WasHidden
  // 4. OnUpdateRect from (1) processed. Does NOT invoke WasResized as view
  //    is hidden. Now renderer/browser out of sync with what they think size
  //    is.
  // By invoking WasResized the renderer is updated as necessary. WasResized
  // does nothing if the sizes are already in sync.
  //
  // TODO: ideally ViewMsg_WasShown would take a size. This way, the renderer
  // could handle both the restore and resize at once. This isn't that big a
  // deal as RenderWidget::WasShown delays updating, so that the resize from
  // WasResized is usually processed before the renderer is painted.
  WasResized();
}

void RenderWidgetHostImpl::WasResized() {
  // Skip if the |delegate_| has already been detached because
  // it's web contents is being deleted.
  if (resize_ack_pending_ || !process_->HasConnection() || !view_ ||
      !renderer_initialized_ || should_auto_resize_ || !delegate_) {
    return;
  }

  gfx::Rect view_bounds = view_->GetViewBounds();
  gfx::Size new_size(view_bounds.size());

  gfx::Size old_physical_backing_size = physical_backing_size_;
  physical_backing_size_ = view_->GetPhysicalBackingSize();
  bool was_fullscreen = is_fullscreen_;
  is_fullscreen_ = IsFullscreen();
  float old_overdraw_bottom_height = overdraw_bottom_height_;
  overdraw_bottom_height_ = view_->GetOverdrawBottomHeight();

  bool size_changed = new_size != last_requested_size_;
  bool side_payload_changed =
      screen_info_out_of_date_ ||
      old_physical_backing_size != physical_backing_size_ ||
      was_fullscreen != is_fullscreen_ ||
      old_overdraw_bottom_height != overdraw_bottom_height_;

  if (!size_changed && !side_payload_changed)
    return;

  if (!screen_info_) {
    screen_info_.reset(new blink::WebScreenInfo);
    GetWebScreenInfo(screen_info_.get());
  }

  // We don't expect to receive an ACK when the requested size or the physical
  // backing size is empty, or when the main viewport size didn't change.
  if (!new_size.IsEmpty() && !physical_backing_size_.IsEmpty() && size_changed)
    resize_ack_pending_ = g_check_for_pending_resize_ack;

  ViewMsg_Resize_Params params;
  params.screen_info = *screen_info_;
  params.new_size = new_size;
  params.physical_backing_size = physical_backing_size_;
  params.overdraw_bottom_height = overdraw_bottom_height_;
  params.resizer_rect = GetRootWindowResizerRect();
  params.is_fullscreen = is_fullscreen_;
  if (!Send(new ViewMsg_Resize(routing_id_, params))) {
    resize_ack_pending_ = false;
  } else {
    last_requested_size_ = new_size;
  }
}

void RenderWidgetHostImpl::ResizeRectChanged(const gfx::Rect& new_rect) {
  Send(new ViewMsg_ChangeResizeRect(routing_id_, new_rect));
}

void RenderWidgetHostImpl::GotFocus() {
  Focus();
}

void RenderWidgetHostImpl::Focus() {
  Send(new InputMsg_SetFocus(routing_id_, true));
}

void RenderWidgetHostImpl::Blur() {
  // If there is a pending mouse lock request, we don't want to reject it at
  // this point. The user can switch focus back to this view and approve the
  // request later.
  if (IsMouseLocked())
    view_->UnlockMouse();

  // If there is a pending overscroll, then that should be cancelled.
  if (overscroll_controller_)
    overscroll_controller_->Cancel();

  Send(new InputMsg_SetFocus(routing_id_, false));
}

void RenderWidgetHostImpl::LostCapture() {
  Send(new InputMsg_MouseCaptureLost(routing_id_));
}

void RenderWidgetHostImpl::SetActive(bool active) {
  Send(new ViewMsg_SetActive(routing_id_, active));
}

void RenderWidgetHostImpl::LostMouseLock() {
  Send(new ViewMsg_MouseLockLost(routing_id_));
}

void RenderWidgetHostImpl::ViewDestroyed() {
  RejectMouseLockOrUnlockIfNecessary();

  // TODO(evanm): tracking this may no longer be necessary;
  // eliminate this function if so.
  SetView(NULL);
}

void RenderWidgetHostImpl::SetIsLoading(bool is_loading) {
  is_loading_ = is_loading;
  if (!view_)
    return;
  view_->SetIsLoading(is_loading);
}

void RenderWidgetHostImpl::CopyFromBackingStore(
    const gfx::Rect& src_subrect,
    const gfx::Size& accelerated_dst_size,
    const base::Callback<void(bool, const SkBitmap&)>& callback,
    const SkBitmap::Config& bitmap_config) {
  if (view_ && is_accelerated_compositing_active_) {
    TRACE_EVENT0("browser",
        "RenderWidgetHostImpl::CopyFromBackingStore::FromCompositingSurface");
    gfx::Rect accelerated_copy_rect = src_subrect.IsEmpty() ?
        gfx::Rect(view_->GetViewBounds().size()) : src_subrect;
    view_->CopyFromCompositingSurface(
        accelerated_copy_rect, accelerated_dst_size, callback, bitmap_config);
    return;
  }

  BackingStore* backing_store = GetBackingStore(false);
  if (!backing_store) {
    callback.Run(false, SkBitmap());
    return;
  }

  TRACE_EVENT0("browser",
      "RenderWidgetHostImpl::CopyFromBackingStore::FromBackingStore");
  gfx::Rect copy_rect = src_subrect.IsEmpty() ?
      gfx::Rect(backing_store->size()) : src_subrect;
  // When the result size is equal to the backing store size, copy from the
  // backing store directly to the output canvas.
  skia::PlatformBitmap output;
  bool result = backing_store->CopyFromBackingStore(copy_rect, &output);
  callback.Run(result, output.GetBitmap());
}

bool RenderWidgetHostImpl::CanCopyFromBackingStore() {
  if (view_)
    return view_->IsSurfaceAvailableForCopy();
  return false;
}

#if defined(OS_ANDROID)
void RenderWidgetHostImpl::LockBackingStore() {
  if (view_)
    view_->LockCompositingSurface();
}

void RenderWidgetHostImpl::UnlockBackingStore() {
  if (view_)
    view_->UnlockCompositingSurface();
}
#endif

#if defined(TOOLKIT_GTK)
bool RenderWidgetHostImpl::CopyFromBackingStoreToGtkWindow(
    const gfx::Rect& dest_rect, GdkWindow* target) {
  BackingStore* backing_store = GetBackingStore(false);
  if (!backing_store)
    return false;
  (static_cast<BackingStoreGtk*>(backing_store))->PaintToRect(
      dest_rect, target);
  return true;
}
#elif defined(OS_MACOSX)
gfx::Size RenderWidgetHostImpl::GetBackingStoreSize() {
  BackingStore* backing_store = GetBackingStore(false);
  return backing_store ? backing_store->size() : gfx::Size();
}

bool RenderWidgetHostImpl::CopyFromBackingStoreToCGContext(
    const CGRect& dest_rect, CGContextRef target) {
  BackingStore* backing_store = GetBackingStore(false);
  if (!backing_store)
    return false;
  (static_cast<BackingStoreMac*>(backing_store))->
      CopyFromBackingStoreToCGContext(dest_rect, target);
  return true;
}
#endif

void RenderWidgetHostImpl::PauseForPendingResizeOrRepaints() {
  TRACE_EVENT0("browser",
      "RenderWidgetHostImpl::PauseForPendingResizeOrRepaints");

  // Do not pause if the view is hidden.
  if (is_hidden())
    return;

  // Do not pause if there is not a paint or resize already coming.
  if (!repaint_ack_pending_ && !resize_ack_pending_ && !view_being_painted_)
    return;

  // Waiting for a backing store will do the wait for us.
  ignore_result(GetBackingStore(true));
}

bool RenderWidgetHostImpl::TryGetBackingStore(const gfx::Size& desired_size,
                                              BackingStore** backing_store) {
  // Check if the view has an accelerated surface of the desired size.
  if (view_->HasAcceleratedSurface(desired_size)) {
    *backing_store = NULL;
    return true;
  }

  // Check for a software backing store of the desired size.
  *backing_store = BackingStoreManager::GetBackingStore(this, desired_size);
  return !!*backing_store;
}

BackingStore* RenderWidgetHostImpl::GetBackingStore(bool force_create) {
  TRACE_EVENT1("browser", "RenderWidgetHostImpl::GetBackingStore",
               "force_create", force_create);

  if (!view_)
    return NULL;

  // The view_size will be current_size_ for auto-sized views and otherwise the
  // size of the view_. (For auto-sized views, current_size_ is updated during
  // UpdateRect messages.)
  gfx::Size view_size = current_size_;
  if (!should_auto_resize_) {
    // Get the desired size from the current view bounds.
    gfx::Rect view_rect = view_->GetViewBounds();
    if (view_rect.IsEmpty())
      return NULL;
    view_size = view_rect.size();
  }

  TRACE_EVENT2("renderer_host", "RenderWidgetHostImpl::GetBackingStore",
               "width", base::IntToString(view_size.width()),
               "height", base::IntToString(view_size.height()));

  // We should not be asked to paint while we are hidden.  If we are hidden,
  // then it means that our consumer failed to call WasShown. If we're not
  // force creating the backing store, it's OK since we can feel free to give
  // out our cached one if we have it.
  DCHECK(!is_hidden_ || !force_create) <<
      "GetBackingStore called while hidden!";

  // We should never be called recursively; this can theoretically lead to
  // infinite recursion and almost certainly leads to lower performance.
  DCHECK(!in_get_backing_store_) << "GetBackingStore called recursively!";
  base::AutoReset<bool> auto_reset_in_get_backing_store(
      &in_get_backing_store_, true);

  // We might have a cached backing store that we can reuse!
  BackingStore* backing_store = NULL;
  if (TryGetBackingStore(view_size, &backing_store) || !force_create)
    return backing_store;

  // We do not have a suitable backing store in the cache, so send out a
  // request to the renderer to paint the view if required.
  if (!repaint_ack_pending_ && !resize_ack_pending_ && !view_being_painted_) {
    repaint_start_time_ = TimeTicks::Now();
    repaint_ack_pending_ = true;
    TRACE_EVENT_ASYNC_BEGIN0(
        "renderer_host", "RenderWidgetHostImpl::repaint_ack_pending_", this);
    Send(new ViewMsg_Repaint(routing_id_, view_size));
  }

  TimeDelta max_delay = TimeDelta::FromMilliseconds(kPaintMsgTimeoutMS);
  TimeTicks end_time = TimeTicks::Now() + max_delay;
  do {
    TRACE_EVENT0("renderer_host", "GetBackingStore::WaitForUpdate");

    // When we have asked the RenderWidget to resize, and we are still waiting
    // on a response, block for a little while to see if we can't get a response
    // before returning the old (incorrectly sized) backing store.
    IPC::Message msg;
    if (process_->WaitForBackingStoreMsg(routing_id_, max_delay, &msg)) {
      OnMessageReceived(msg);

      // For auto-resized views, current_size_ determines the view_size and it
      // may have changed during the handling of an UpdateRect message.
      if (should_auto_resize_)
        view_size = current_size_;

      // Break now if we got a backing store or accelerated surface of the
      // correct size.
      if (TryGetBackingStore(view_size, &backing_store) ||
          abort_get_backing_store_) {
        abort_get_backing_store_ = false;
        return backing_store;
      }
    } else {
      TRACE_EVENT0("renderer_host", "GetBackingStore::Timeout");
      break;
    }

    // Loop if we still have time left and haven't gotten a properly sized
    // BackingStore yet. This is necessary to support the GPU path which
    // typically has multiple frames pipelined -- we may need to skip one or two
    // BackingStore messages to get to the latest.
    max_delay = end_time - TimeTicks::Now();
  } while (max_delay > TimeDelta::FromSeconds(0));

  // We have failed to get a backing store of view_size. Fall back on
  // current_size_ to avoid a white flash while resizing slow pages.
  if (view_size != current_size_)
    TryGetBackingStore(current_size_, &backing_store);
  return backing_store;
}

BackingStore* RenderWidgetHostImpl::AllocBackingStore(const gfx::Size& size) {
  if (!view_)
    return NULL;
  return view_->AllocBackingStore(size);
}

void RenderWidgetHostImpl::DonePaintingToBackingStore() {
  Send(new ViewMsg_UpdateRect_ACK(GetRoutingID()));
}

bool RenderWidgetHostImpl::ScheduleComposite() {
  if (is_hidden_ || !is_accelerated_compositing_active_ ||
      current_size_.IsEmpty() || repaint_ack_pending_ ||
      resize_ack_pending_ || view_being_painted_) {
    return false;
  }

  // Send out a request to the renderer to paint the view if required.
  repaint_start_time_ = TimeTicks::Now();
  repaint_ack_pending_ = true;
  TRACE_EVENT_ASYNC_BEGIN0(
      "renderer_host", "RenderWidgetHostImpl::repaint_ack_pending_", this);
  Send(new ViewMsg_Repaint(routing_id_, current_size_));
  return true;
}

void RenderWidgetHostImpl::StartHangMonitorTimeout(base::TimeDelta delay) {
  if (hang_monitor_timeout_)
    hang_monitor_timeout_->Start(delay);
}

void RenderWidgetHostImpl::RestartHangMonitorTimeout() {
  if (hang_monitor_timeout_)
    hang_monitor_timeout_->Restart(
        base::TimeDelta::FromMilliseconds(hung_renderer_delay_ms_));
}

void RenderWidgetHostImpl::StopHangMonitorTimeout() {
  if (hang_monitor_timeout_)
    hang_monitor_timeout_->Stop();
  RendererIsResponsive();
}

void RenderWidgetHostImpl::EnableFullAccessibilityMode() {
  AddAccessibilityMode(AccessibilityModeComplete);
}

bool RenderWidgetHostImpl::IsFullAccessibilityModeForTesting() {
  return accessibility_mode() == AccessibilityModeComplete;
}

void RenderWidgetHostImpl::EnableTreeOnlyAccessibilityMode() {
  AddAccessibilityMode(AccessibilityModeTreeOnly);
}

bool RenderWidgetHostImpl::IsTreeOnlyAccessibilityModeForTesting() {
  return accessibility_mode() == AccessibilityModeTreeOnly;
}

void RenderWidgetHostImpl::ForwardMouseEvent(const WebMouseEvent& mouse_event) {
  ForwardMouseEventWithLatencyInfo(mouse_event, ui::LatencyInfo());
}

void RenderWidgetHostImpl::ForwardMouseEventWithLatencyInfo(
      const blink::WebMouseEvent& mouse_event,
      const ui::LatencyInfo& ui_latency) {
  TRACE_EVENT2("input", "RenderWidgetHostImpl::ForwardMouseEvent",
               "x", mouse_event.x, "y", mouse_event.y);

  ui::LatencyInfo latency_info =
      CreateRWHLatencyInfoIfNotExist(&ui_latency, mouse_event.type);

  for (size_t i = 0; i < mouse_event_callbacks_.size(); ++i) {
    if (mouse_event_callbacks_[i].Run(mouse_event))
      return;
  }

  if (IgnoreInputEvents())
    return;

  input_router_->SendMouseEvent(MouseEventWithLatencyInfo(mouse_event,
                                                          latency_info));
}

void RenderWidgetHostImpl::OnPointerEventActivate() {
}

void RenderWidgetHostImpl::ForwardWheelEvent(
    const WebMouseWheelEvent& wheel_event) {
  ForwardWheelEventWithLatencyInfo(wheel_event, ui::LatencyInfo());
}

void RenderWidgetHostImpl::ForwardWheelEventWithLatencyInfo(
      const blink::WebMouseWheelEvent& wheel_event,
      const ui::LatencyInfo& ui_latency) {
  TRACE_EVENT0("input", "RenderWidgetHostImpl::ForwardWheelEvent");

  ui::LatencyInfo latency_info =
      CreateRWHLatencyInfoIfNotExist(&ui_latency, wheel_event.type);

  if (IgnoreInputEvents())
    return;

  input_router_->SendWheelEvent(MouseWheelEventWithLatencyInfo(wheel_event,
                                                               latency_info));
}

void RenderWidgetHostImpl::ForwardGestureEvent(
    const blink::WebGestureEvent& gesture_event) {
  ForwardGestureEventWithLatencyInfo(gesture_event, ui::LatencyInfo());
}

void RenderWidgetHostImpl::ForwardGestureEventWithLatencyInfo(
    const blink::WebGestureEvent& gesture_event,
    const ui::LatencyInfo& ui_latency) {
  TRACE_EVENT0("input", "RenderWidgetHostImpl::ForwardGestureEvent");
  // Early out if necessary, prior to performing latency logic.
  if (IgnoreInputEvents())
    return;

  if (delegate_->PreHandleGestureEvent(gesture_event))
    return;

  ui::LatencyInfo latency_info =
      CreateRWHLatencyInfoIfNotExist(&ui_latency, gesture_event.type);

  if (gesture_event.type == blink::WebInputEvent::GestureScrollUpdate) {
    latency_info.AddLatencyNumber(
        ui::INPUT_EVENT_LATENCY_SCROLL_UPDATE_RWH_COMPONENT,
        GetLatencyComponentId(),
        ++last_input_number_);

    // Make a copy of the INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT with a
    // different name INPUT_EVENT_LATENCY_SCROLL_UPDATE_ORIGINAL_COMPONENT.
    // So we can track the latency specifically for scroll update events.
    ui::LatencyInfo::LatencyComponent original_component;
    if (latency_info.FindLatency(ui::INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT,
                                 0,
                                 &original_component)) {
      latency_info.AddLatencyNumberWithTimestamp(
          ui::INPUT_EVENT_LATENCY_SCROLL_UPDATE_ORIGINAL_COMPONENT,
          GetLatencyComponentId(),
          original_component.sequence_number,
          original_component.event_time,
          original_component.event_count);
    }
  }

  GestureEventWithLatencyInfo gesture_with_latency(gesture_event, latency_info);
  input_router_->SendGestureEvent(gesture_with_latency);
}

void RenderWidgetHostImpl::ForwardTouchEventWithLatencyInfo(
      const blink::WebTouchEvent& touch_event,
      const ui::LatencyInfo& ui_latency) {
  TRACE_EVENT0("input", "RenderWidgetHostImpl::ForwardTouchEvent");

  // Always forward TouchEvents for touch stream consistency. They will be
  // ignored if appropriate in FilterInputEvent().

  ui::LatencyInfo latency_info =
      CreateRWHLatencyInfoIfNotExist(&ui_latency, touch_event.type);
  TouchEventWithLatencyInfo touch_with_latency(touch_event, latency_info);
  input_router_->SendTouchEvent(touch_with_latency);
}

void RenderWidgetHostImpl::ForwardKeyboardEvent(
    const NativeWebKeyboardEvent& key_event) {
  TRACE_EVENT0("input", "RenderWidgetHostImpl::ForwardKeyboardEvent");
  if (IgnoreInputEvents())
    return;

  if (!process_->HasConnection())
    return;

  // First, let keypress listeners take a shot at handling the event.  If a
  // listener handles the event, it should not be propagated to the renderer.
  if (KeyPressListenersHandleEvent(key_event)) {
    // Some keypresses that are accepted by the listener might have follow up
    // char events, which should be ignored.
    if (key_event.type == WebKeyboardEvent::RawKeyDown)
      suppress_next_char_events_ = true;
    return;
  }

  if (key_event.type == WebKeyboardEvent::Char &&
      (key_event.windowsKeyCode == ui::VKEY_RETURN ||
       key_event.windowsKeyCode == ui::VKEY_SPACE)) {
    OnUserGesture();
  }

  // Double check the type to make sure caller hasn't sent us nonsense that
  // will mess up our key queue.
  if (!WebInputEvent::isKeyboardEventType(key_event.type))
    return;

  if (suppress_next_char_events_) {
    // If preceding RawKeyDown event was handled by the browser, then we need
    // suppress all Char events generated by it. Please note that, one
    // RawKeyDown event may generate multiple Char events, so we can't reset
    // |suppress_next_char_events_| until we get a KeyUp or a RawKeyDown.
    if (key_event.type == WebKeyboardEvent::Char)
      return;
    // We get a KeyUp or a RawKeyDown event.
    suppress_next_char_events_ = false;
  }

  bool is_shortcut = false;

  // Only pre-handle the key event if it's not handled by the input method.
  if (delegate_ && !key_event.skip_in_browser) {
    // We need to set |suppress_next_char_events_| to true if
    // PreHandleKeyboardEvent() returns true, but |this| may already be
    // destroyed at that time. So set |suppress_next_char_events_| true here,
    // then revert it afterwards when necessary.
    if (key_event.type == WebKeyboardEvent::RawKeyDown)
      suppress_next_char_events_ = true;

    // Tab switching/closing accelerators aren't sent to the renderer to avoid
    // a hung/malicious renderer from interfering.
    if (delegate_->PreHandleKeyboardEvent(key_event, &is_shortcut))
      return;

    if (key_event.type == WebKeyboardEvent::RawKeyDown)
      suppress_next_char_events_ = false;
  }

  input_router_->SendKeyboardEvent(
      key_event,
      CreateRWHLatencyInfoIfNotExist(NULL, key_event.type),
      is_shortcut);
}

void RenderWidgetHostImpl::QueueSyntheticGesture(
    scoped_ptr<SyntheticGesture> synthetic_gesture,
    const base::Callback<void(SyntheticGesture::Result)>& on_complete) {
  if (!synthetic_gesture_controller_ && view_) {
    synthetic_gesture_controller_.reset(
        new SyntheticGestureController(
            view_->CreateSyntheticGestureTarget().Pass()));
  }
  if (synthetic_gesture_controller_) {
    synthetic_gesture_controller_->QueueSyntheticGesture(
        synthetic_gesture.Pass(), on_complete);
  }
}

void RenderWidgetHostImpl::SendCursorVisibilityState(bool is_visible) {
  Send(new InputMsg_CursorVisibilityChange(GetRoutingID(), is_visible));
}

int64 RenderWidgetHostImpl::GetLatencyComponentId() {
  return GetRoutingID() | (static_cast<int64>(GetProcess()->GetID()) << 32);
}

// static
void RenderWidgetHostImpl::DisableResizeAckCheckForTesting() {
  g_check_for_pending_resize_ack = false;
}

ui::LatencyInfo RenderWidgetHostImpl::CreateRWHLatencyInfoIfNotExist(
    const ui::LatencyInfo* original, WebInputEvent::Type type) {
  ui::LatencyInfo info;
  if (original)
    info = *original;
  // In Aura, gesture event will already carry its original touch event's
  // INPUT_EVENT_LATENCY_RWH_COMPONENT.
  if (!info.FindLatency(ui::INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT,
                        GetLatencyComponentId(),
                        NULL)) {
    info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT,
                          GetLatencyComponentId(),
                          ++last_input_number_);
    info.TraceEventType(WebInputEventTraits::GetName(type));
  }
  return info;
}


void RenderWidgetHostImpl::AddKeyPressEventCallback(
    const KeyPressEventCallback& callback) {
  key_press_event_callbacks_.push_back(callback);
}

void RenderWidgetHostImpl::RemoveKeyPressEventCallback(
    const KeyPressEventCallback& callback) {
  for (size_t i = 0; i < key_press_event_callbacks_.size(); ++i) {
    if (key_press_event_callbacks_[i].Equals(callback)) {
      key_press_event_callbacks_.erase(
          key_press_event_callbacks_.begin() + i);
      return;
    }
  }
}

void RenderWidgetHostImpl::AddMouseEventCallback(
    const MouseEventCallback& callback) {
  mouse_event_callbacks_.push_back(callback);
}

void RenderWidgetHostImpl::RemoveMouseEventCallback(
    const MouseEventCallback& callback) {
  for (size_t i = 0; i < mouse_event_callbacks_.size(); ++i) {
    if (mouse_event_callbacks_[i].Equals(callback)) {
      mouse_event_callbacks_.erase(mouse_event_callbacks_.begin() + i);
      return;
    }
  }
}

void RenderWidgetHostImpl::GetWebScreenInfo(blink::WebScreenInfo* result) {
  TRACE_EVENT0("renderer_host", "RenderWidgetHostImpl::GetWebScreenInfo");
  if (GetView())
    static_cast<RenderWidgetHostViewPort*>(GetView())->GetScreenInfo(result);
  else
    RenderWidgetHostViewPort::GetDefaultScreenInfo(result);
  screen_info_out_of_date_ = false;
}

const NativeWebKeyboardEvent*
    RenderWidgetHostImpl::GetLastKeyboardEvent() const {
  return input_router_->GetLastKeyboardEvent();
}

void RenderWidgetHostImpl::NotifyScreenInfoChanged() {
  // The resize message (which may not happen immediately) will carry with it
  // the screen info as well as the new size (if the screen has changed scale
  // factor).
  InvalidateScreenInfo();
  WasResized();
}

void RenderWidgetHostImpl::InvalidateScreenInfo() {
  screen_info_out_of_date_ = true;
  screen_info_.reset();
}

void RenderWidgetHostImpl::GetSnapshotFromRenderer(
    const gfx::Rect& src_subrect,
    const base::Callback<void(bool, const SkBitmap&)>& callback) {
  TRACE_EVENT0("browser", "RenderWidgetHostImpl::GetSnapshotFromRenderer");
  if (!view_) {
    callback.Run(false, SkBitmap());
    return;
  }

  pending_snapshots_.push(callback);

  gfx::Rect copy_rect = src_subrect.IsEmpty() ?
      gfx::Rect(view_->GetViewBounds().size()) : src_subrect;

  gfx::Rect copy_rect_in_pixel = ConvertViewRectToPixel(view_, copy_rect);
  Send(new ViewMsg_Snapshot(GetRoutingID(), copy_rect_in_pixel));
}

void RenderWidgetHostImpl::OnSelectionChanged(const base::string16& text,
                                              size_t offset,
                                              const gfx::Range& range) {
  if (view_)
    view_->SelectionChanged(text, offset, range);
}

void RenderWidgetHostImpl::OnSelectionBoundsChanged(
    const ViewHostMsg_SelectionBounds_Params& params) {
  if (view_) {
    view_->SelectionBoundsChanged(params);
  }
}

void RenderWidgetHostImpl::OnSnapshot(bool success,
                                    const SkBitmap& bitmap) {
  if (pending_snapshots_.size() == 0) {
    LOG(ERROR) << "RenderWidgetHostImpl::OnSnapshot: "
                  "Received a snapshot that was not requested.";
    return;
  }

  base::Callback<void(bool, const SkBitmap&)> callback =
      pending_snapshots_.front();
  pending_snapshots_.pop();

  if (!success) {
    callback.Run(success, SkBitmap());
    return;
  }

  callback.Run(success, bitmap);
}

void RenderWidgetHostImpl::UpdateVSyncParameters(base::TimeTicks timebase,
                                                 base::TimeDelta interval) {
  Send(new ViewMsg_UpdateVSyncParameters(GetRoutingID(), timebase, interval));
}

void RenderWidgetHostImpl::RendererExited(base::TerminationStatus status,
                                          int exit_code) {
  // Clearing this flag causes us to re-create the renderer when recovering
  // from a crashed renderer.
  renderer_initialized_ = false;

  waiting_for_screen_rects_ack_ = false;

  // Reset to ensure that input routing works with a new renderer.
  input_router_.reset(new InputRouterImpl(process_, this, this, routing_id_));

  if (overscroll_controller_)
    overscroll_controller_->Reset();

 // Must reset these to ensure that keyboard events work with a new renderer.
  suppress_next_char_events_ = false;

  // Reset some fields in preparation for recovering from a crash.
  ResetSizeAndRepaintPendingFlags();
  current_size_.SetSize(0, 0);
  is_hidden_ = false;
  is_accelerated_compositing_active_ = false;

  // Reset this to ensure the hung renderer mechanism is working properly.
  in_flight_event_count_ = 0;

  if (view_) {
    GpuSurfaceTracker::Get()->SetSurfaceHandle(surface_id_,
                                               gfx::GLSurfaceHandle());
    view_->RenderProcessGone(status, exit_code);
    view_ = NULL;  // The View should be deleted by RenderProcessGone.
  }

  BackingStoreManager::RemoveBackingStore(this);

  synthetic_gesture_controller_.reset();
}

void RenderWidgetHostImpl::UpdateTextDirection(WebTextDirection direction) {
  text_direction_updated_ = true;
  text_direction_ = direction;
}

void RenderWidgetHostImpl::CancelUpdateTextDirection() {
  if (text_direction_updated_)
    text_direction_canceled_ = true;
}

void RenderWidgetHostImpl::NotifyTextDirection() {
  if (text_direction_updated_) {
    if (!text_direction_canceled_)
      Send(new ViewMsg_SetTextDirection(GetRoutingID(), text_direction_));
    text_direction_updated_ = false;
    text_direction_canceled_ = false;
  }
}

void RenderWidgetHostImpl::SetInputMethodActive(bool activate) {
  input_method_active_ = activate;
  Send(new ViewMsg_SetInputMethodActive(GetRoutingID(), activate));
}

void RenderWidgetHostImpl::CandidateWindowShown() {
  Send(new ViewMsg_CandidateWindowShown(GetRoutingID()));
}

void RenderWidgetHostImpl::CandidateWindowUpdated() {
  Send(new ViewMsg_CandidateWindowUpdated(GetRoutingID()));
}

void RenderWidgetHostImpl::CandidateWindowHidden() {
  Send(new ViewMsg_CandidateWindowHidden(GetRoutingID()));
}

void RenderWidgetHostImpl::ImeSetComposition(
    const base::string16& text,
    const std::vector<blink::WebCompositionUnderline>& underlines,
    int selection_start,
    int selection_end) {
  Send(new ViewMsg_ImeSetComposition(
            GetRoutingID(), text, underlines, selection_start, selection_end));
}

void RenderWidgetHostImpl::ImeConfirmComposition(
    const base::string16& text,
    const gfx::Range& replacement_range,
    bool keep_selection) {
  Send(new ViewMsg_ImeConfirmComposition(
        GetRoutingID(), text, replacement_range, keep_selection));
}

void RenderWidgetHostImpl::ImeCancelComposition() {
  Send(new ViewMsg_ImeSetComposition(GetRoutingID(), base::string16(),
            std::vector<blink::WebCompositionUnderline>(), 0, 0));
}

gfx::Rect RenderWidgetHostImpl::GetRootWindowResizerRect() const {
  return gfx::Rect();
}

void RenderWidgetHostImpl::RequestToLockMouse(bool user_gesture,
                                              bool last_unlocked_by_target) {
  // Directly reject to lock the mouse. Subclass can override this method to
  // decide whether to allow mouse lock or not.
  GotResponseToLockMouseRequest(false);
}

void RenderWidgetHostImpl::RejectMouseLockOrUnlockIfNecessary() {
  DCHECK(!pending_mouse_lock_request_ || !IsMouseLocked());
  if (pending_mouse_lock_request_) {
    pending_mouse_lock_request_ = false;
    Send(new ViewMsg_LockMouse_ACK(routing_id_, false));
  } else if (IsMouseLocked()) {
    view_->UnlockMouse();
  }
}

bool RenderWidgetHostImpl::IsMouseLocked() const {
  return view_ ? view_->IsMouseLocked() : false;
}

bool RenderWidgetHostImpl::IsFullscreen() const {
  return false;
}

void RenderWidgetHostImpl::SetShouldAutoResize(bool enable) {
  should_auto_resize_ = enable;
}

void RenderWidgetHostImpl::Destroy() {
  NotificationService::current()->Notify(
      NOTIFICATION_RENDER_WIDGET_HOST_DESTROYED,
      Source<RenderWidgetHost>(this),
      NotificationService::NoDetails());

  // Tell the view to die.
  // Note that in the process of the view shutting down, it can call a ton
  // of other messages on us.  So if you do any other deinitialization here,
  // do it after this call to view_->Destroy().
  if (view_)
    view_->Destroy();

  delete this;
}

void RenderWidgetHostImpl::RendererIsUnresponsive() {
  NotificationService::current()->Notify(
      NOTIFICATION_RENDER_WIDGET_HOST_HANG,
      Source<RenderWidgetHost>(this),
      NotificationService::NoDetails());
  is_unresponsive_ = true;
  NotifyRendererUnresponsive();
}

void RenderWidgetHostImpl::RendererIsResponsive() {
  if (is_unresponsive_) {
    is_unresponsive_ = false;
    NotifyRendererResponsive();
  }
}

void RenderWidgetHostImpl::OnRenderViewReady() {
  SendScreenRects();
  WasResized();
}

void RenderWidgetHostImpl::OnRenderProcessGone(int status, int exit_code) {
  // TODO(evanm): This synchronously ends up calling "delete this".
  // Is that really what we want in response to this message?  I'm matching
  // previous behavior of the code here.
  Destroy();
}

void RenderWidgetHostImpl::OnClose() {
  Shutdown();
}

void RenderWidgetHostImpl::OnSetTooltipText(
    const base::string16& tooltip_text,
    WebTextDirection text_direction_hint) {
  // First, add directionality marks around tooltip text if necessary.
  // A naive solution would be to simply always wrap the text. However, on
  // windows, Unicode directional embedding characters can't be displayed on
  // systems that lack RTL fonts and are instead displayed as empty squares.
  //
  // To get around this we only wrap the string when we deem it necessary i.e.
  // when the locale direction is different than the tooltip direction hint.
  //
  // Currently, we use element's directionality as the tooltip direction hint.
  // An alternate solution would be to set the overall directionality based on
  // trying to detect the directionality from the tooltip text rather than the
  // element direction.  One could argue that would be a preferable solution
  // but we use the current approach to match Fx & IE's behavior.
  base::string16 wrapped_tooltip_text = tooltip_text;
  if (!tooltip_text.empty()) {
    if (text_direction_hint == blink::WebTextDirectionLeftToRight) {
      // Force the tooltip to have LTR directionality.
      wrapped_tooltip_text =
          base::i18n::GetDisplayStringInLTRDirectionality(wrapped_tooltip_text);
    } else if (text_direction_hint == blink::WebTextDirectionRightToLeft &&
               !base::i18n::IsRTL()) {
      // Force the tooltip to have RTL directionality.
      base::i18n::WrapStringWithRTLFormatting(&wrapped_tooltip_text);
    }
  }
  if (GetView())
    view_->SetTooltipText(wrapped_tooltip_text);
}

void RenderWidgetHostImpl::OnUpdateScreenRectsAck() {
  waiting_for_screen_rects_ack_ = false;
  if (!view_)
    return;

  if (view_->GetViewBounds() == last_view_screen_rect_ &&
      view_->GetBoundsInRootWindow() == last_window_screen_rect_) {
    return;
  }

  SendScreenRects();
}

void RenderWidgetHostImpl::OnRequestMove(const gfx::Rect& pos) {
  if (view_) {
    view_->SetBounds(pos);
    Send(new ViewMsg_Move_ACK(routing_id_));
  }
}

#if defined(OS_MACOSX)
void RenderWidgetHostImpl::OnCompositorSurfaceBuffersSwapped(
      const ViewHostMsg_CompositorSurfaceBuffersSwapped_Params& params) {
  TRACE_EVENT0("renderer_host",
               "RenderWidgetHostImpl::OnCompositorSurfaceBuffersSwapped");
  if (!ui::LatencyInfo::Verify(params.latency_info,
                               "ViewHostMsg_CompositorSurfaceBuffersSwapped"))
    return;
  if (!view_) {
    AcceleratedSurfaceMsg_BufferPresented_Params ack_params;
    ack_params.sync_point = 0;
    RenderWidgetHostImpl::AcknowledgeBufferPresent(params.route_id,
                                                   params.gpu_process_host_id,
                                                   ack_params);
    return;
  }
  GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params gpu_params;
  gpu_params.surface_id = params.surface_id;
  gpu_params.surface_handle = params.surface_handle;
  gpu_params.route_id = params.route_id;
  gpu_params.size = params.size;
  gpu_params.scale_factor = params.scale_factor;
  gpu_params.latency_info = params.latency_info;
  for (size_t i = 0; i < gpu_params.latency_info.size(); i++)
    AddLatencyInfoComponentIds(&gpu_params.latency_info[i]);
  view_->AcceleratedSurfaceBuffersSwapped(gpu_params,
                                          params.gpu_process_host_id);
  view_->DidReceiveRendererFrame();
}
#endif  // OS_MACOSX

bool RenderWidgetHostImpl::OnSwapCompositorFrame(
    const IPC::Message& message) {
  ViewHostMsg_SwapCompositorFrame::Param param;
  if (!ViewHostMsg_SwapCompositorFrame::Read(&message, &param))
    return false;
  scoped_ptr<cc::CompositorFrame> frame(new cc::CompositorFrame);
  uint32 output_surface_id = param.a;
  param.b.AssignTo(frame.get());

  for (size_t i = 0; i < frame->metadata.latency_info.size(); i++)
    AddLatencyInfoComponentIds(&frame->metadata.latency_info[i]);

  input_router_->OnViewUpdated(
      GetInputRouterViewFlagsFromCompositorFrameMetadata(frame->metadata));

  if (view_) {
    view_->OnSwapCompositorFrame(output_surface_id, frame.Pass());
    view_->DidReceiveRendererFrame();
  } else {
    cc::CompositorFrameAck ack;
    if (frame->gl_frame_data) {
      ack.gl_frame_data = frame->gl_frame_data.Pass();
      ack.gl_frame_data->sync_point = 0;
    } else if (frame->delegated_frame_data) {
      cc::TransferableResource::ReturnResources(
          frame->delegated_frame_data->resource_list,
          &ack.resources);
    } else if (frame->software_frame_data) {
      ack.last_software_frame_id = frame->software_frame_data->id;
    }
    SendSwapCompositorFrameAck(routing_id_, output_surface_id,
                               process_->GetID(), ack);
  }
  return true;
}

void RenderWidgetHostImpl::OnOverscrolled(
    gfx::Vector2dF accumulated_overscroll,
    gfx::Vector2dF current_fling_velocity) {
  if (view_)
    view_->OnOverscrolled(accumulated_overscroll, current_fling_velocity);
}

void RenderWidgetHostImpl::OnFlingingStopped() {
  if (view_)
    view_->DidStopFlinging();
}

void RenderWidgetHostImpl::OnUpdateRect(
    const ViewHostMsg_UpdateRect_Params& params) {
  TRACE_EVENT0("renderer_host", "RenderWidgetHostImpl::OnUpdateRect");
  TimeTicks paint_start = TimeTicks::Now();

  // Update our knowledge of the RenderWidget's size.
  current_size_ = params.view_size;
  // Update our knowledge of the RenderWidget's scroll offset.
  last_scroll_offset_ = params.scroll_offset;

  bool is_resize_ack =
      ViewHostMsg_UpdateRect_Flags::is_resize_ack(params.flags);

  // resize_ack_pending_ needs to be cleared before we call DidPaintRect, since
  // that will end up reaching GetBackingStore.
  if (is_resize_ack) {
    DCHECK(!g_check_for_pending_resize_ack || resize_ack_pending_);
    resize_ack_pending_ = false;
  }

  bool is_repaint_ack =
      ViewHostMsg_UpdateRect_Flags::is_repaint_ack(params.flags);
  if (is_repaint_ack) {
    DCHECK(repaint_ack_pending_);
    TRACE_EVENT_ASYNC_END0(
        "renderer_host", "RenderWidgetHostImpl::repaint_ack_pending_", this);
    repaint_ack_pending_ = false;
    TimeDelta delta = TimeTicks::Now() - repaint_start_time_;
    UMA_HISTOGRAM_TIMES("MPArch.RWH_RepaintDelta", delta);
  }

  DCHECK(!params.view_size.IsEmpty());

  bool was_async = false;

  // If this is a GPU UpdateRect, params.bitmap is invalid and dib will be NULL.
  TransportDIB* dib = process_->GetTransportDIB(params.bitmap);

  // If gpu process does painting, scroll_rect and copy_rects are always empty
  // and backing store is never used.
  if (dib) {
    DCHECK(!params.bitmap_rect.IsEmpty());
    gfx::Size pixel_size = gfx::ToFlooredSize(
        gfx::ScaleSize(params.bitmap_rect.size(), params.scale_factor));
    const size_t size = pixel_size.height() * pixel_size.width() * 4;
    if (dib->size() < size) {
      DLOG(WARNING) << "Transport DIB too small for given rectangle";
      RecordAction(base::UserMetricsAction("BadMessageTerminate_RWH1"));
      GetProcess()->ReceivedBadMessage();
    } else {
      // Scroll the backing store.
      if (!params.scroll_rect.IsEmpty()) {
        ScrollBackingStoreRect(params.scroll_delta,
                               params.scroll_rect,
                               params.view_size);
      }

      // Paint the backing store. This will update it with the
      // renderer-supplied bits. The view will read out of the backing store
      // later to actually draw to the screen.
      was_async = PaintBackingStoreRect(
          params.bitmap,
          params.bitmap_rect,
          params.copy_rects,
          params.view_size,
          params.scale_factor,
          base::Bind(&RenderWidgetHostImpl::DidUpdateBackingStore,
                     weak_factory_.GetWeakPtr(), params, paint_start));
    }
  }

  if (!was_async) {
    DidUpdateBackingStore(params, paint_start);
  }

  if (should_auto_resize_) {
    bool post_callback = new_auto_size_.IsEmpty();
    new_auto_size_ = params.view_size;
    if (post_callback) {
      base::MessageLoop::current()->PostTask(
          FROM_HERE,
          base::Bind(&RenderWidgetHostImpl::DelayedAutoResized,
                     weak_factory_.GetWeakPtr()));
    }
  }

  // Log the time delta for processing a paint message. On platforms that don't
  // support asynchronous painting, this is equivalent to
  // MPArch.RWH_TotalPaintTime.
  TimeDelta delta = TimeTicks::Now() - paint_start;
  UMA_HISTOGRAM_TIMES("MPArch.RWH_OnMsgUpdateRect", delta);
}

void RenderWidgetHostImpl::OnUpdateIsDelayed() {
  if (in_get_backing_store_)
    abort_get_backing_store_ = true;
}

void RenderWidgetHostImpl::DidUpdateBackingStore(
    const ViewHostMsg_UpdateRect_Params& params,
    const TimeTicks& paint_start) {
  TRACE_EVENT0("renderer_host", "RenderWidgetHostImpl::DidUpdateBackingStore");
  TimeTicks update_start = TimeTicks::Now();

  if (params.needs_ack) {
    // ACK early so we can prefetch the next PaintRect if there is a next one.
    // This must be done AFTER we're done painting with the bitmap supplied by
    // the renderer. This ACK is a signal to the renderer that the backing store
    // can be re-used, so the bitmap may be invalid after this call.
    Send(new ViewMsg_UpdateRect_ACK(routing_id_));
  }

  // Move the plugins if the view hasn't already been destroyed.  Plugin moves
  // will not be re-issued, so must move them now, regardless of whether we
  // paint or not.  MovePluginWindows attempts to move the plugin windows and
  // in the process could dispatch other window messages which could cause the
  // view to be destroyed.
  if (view_)
    view_->MovePluginWindows(params.scroll_offset, params.plugin_window_moves);

  NotificationService::current()->Notify(
      NOTIFICATION_RENDER_WIDGET_HOST_DID_UPDATE_BACKING_STORE,
      Source<RenderWidgetHost>(this),
      NotificationService::NoDetails());

  // We don't need to update the view if the view is hidden. We must do this
  // early return after the ACK is sent, however, or the renderer will not send
  // us more data.
  if (is_hidden_)
    return;

  // Now paint the view. Watch out: it might be destroyed already.
  if (view_ && !is_accelerated_compositing_active_) {

    std::vector<ui::LatencyInfo> latency_info;
    for (size_t i = 0; i < params.latency_info.size(); i++) {
      ui::LatencyInfo info = params.latency_info[i];
      AddLatencyInfoComponentIds(&info);
      latency_info.push_back(info);
    }

    view_being_painted_ = true;
    view_->DidUpdateBackingStore(params.scroll_rect, params.scroll_delta,
                                 params.copy_rects, latency_info);
    view_->DidReceiveRendererFrame();
    view_being_painted_ = false;
  }

  // If we got a resize ack, then perhaps we have another resize to send?
  bool is_resize_ack =
      ViewHostMsg_UpdateRect_Flags::is_resize_ack(params.flags);
  if (is_resize_ack)
    WasResized();

  // Log the time delta for processing a paint message.
  TimeTicks now = TimeTicks::Now();
  TimeDelta delta = now - update_start;
  UMA_HISTOGRAM_TIMES("MPArch.RWH_DidUpdateBackingStore", delta);

  // Measures the time from receiving the MsgUpdateRect IPC to completing the
  // DidUpdateBackingStore() method.  On platforms which have asynchronous
  // painting, such as Linux, this is the sum of MPArch.RWH_OnMsgUpdateRect,
  // MPArch.RWH_DidUpdateBackingStore, and the time spent asynchronously
  // waiting for the paint to complete.
  //
  // On other platforms, this will be equivalent to MPArch.RWH_OnMsgUpdateRect.
  delta = now - paint_start;
  UMA_HISTOGRAM_TIMES("MPArch.RWH_TotalPaintTime", delta);
}

void RenderWidgetHostImpl::OnQueueSyntheticGesture(
    const SyntheticGesturePacket& gesture_packet) {
  // Only allow untrustworthy gestures if explicitly enabled.
  if (!CommandLine::ForCurrentProcess()->HasSwitch(
          cc::switches::kEnableGpuBenchmarking)) {
    RecordAction(base::UserMetricsAction("BadMessageTerminate_RWH7"));
    GetProcess()->ReceivedBadMessage();
    return;
  }

  QueueSyntheticGesture(
        SyntheticGesture::Create(*gesture_packet.gesture_params()),
        base::Bind(&RenderWidgetHostImpl::OnSyntheticGestureCompleted,
                   weak_factory_.GetWeakPtr()));
}

void RenderWidgetHostImpl::OnFocus() {
  // Only RenderViewHost can deal with that message.
  RecordAction(base::UserMetricsAction("BadMessageTerminate_RWH4"));
  GetProcess()->ReceivedBadMessage();
}

void RenderWidgetHostImpl::OnBlur() {
  // Only RenderViewHost can deal with that message.
  RecordAction(base::UserMetricsAction("BadMessageTerminate_RWH5"));
  GetProcess()->ReceivedBadMessage();
}

void RenderWidgetHostImpl::OnSetCursor(const WebCursor& cursor) {
  if (!view_) {
    return;
  }
  view_->UpdateCursor(cursor);
}

void RenderWidgetHostImpl::OnTextInputTypeChanged(
    ui::TextInputType type,
    ui::TextInputMode input_mode,
    bool can_compose_inline) {
  if (view_)
    view_->TextInputTypeChanged(type, input_mode, can_compose_inline);
}

#if defined(OS_MACOSX) || defined(OS_WIN) || defined(USE_AURA)
void RenderWidgetHostImpl::OnImeCompositionRangeChanged(
    const gfx::Range& range,
    const std::vector<gfx::Rect>& character_bounds) {
  if (view_)
    view_->ImeCompositionRangeChanged(range, character_bounds);
}
#endif

void RenderWidgetHostImpl::OnImeCancelComposition() {
  if (view_)
    view_->ImeCancelComposition();
}

void RenderWidgetHostImpl::OnDidActivateAcceleratedCompositing(bool activated) {
  TRACE_EVENT1("renderer_host",
               "RenderWidgetHostImpl::OnDidActivateAcceleratedCompositing",
               "activated", activated);
  is_accelerated_compositing_active_ = activated;
  if (view_)
    view_->OnAcceleratedCompositingStateChange();
}

void RenderWidgetHostImpl::OnLockMouse(bool user_gesture,
                                       bool last_unlocked_by_target,
                                       bool privileged) {

  if (pending_mouse_lock_request_) {
    Send(new ViewMsg_LockMouse_ACK(routing_id_, false));
    return;
  } else if (IsMouseLocked()) {
    Send(new ViewMsg_LockMouse_ACK(routing_id_, true));
    return;
  }

  pending_mouse_lock_request_ = true;
  if (privileged && allow_privileged_mouse_lock_) {
    // Directly approve to lock the mouse.
    GotResponseToLockMouseRequest(true);
  } else {
    RequestToLockMouse(user_gesture, last_unlocked_by_target);
  }
}

void RenderWidgetHostImpl::OnUnlockMouse() {
  RejectMouseLockOrUnlockIfNecessary();
}

void RenderWidgetHostImpl::OnShowDisambiguationPopup(
    const gfx::Rect& rect,
    const gfx::Size& size,
    const TransportDIB::Id& id) {
  DCHECK(!rect.IsEmpty());
  DCHECK(!size.IsEmpty());

  TransportDIB* dib = process_->GetTransportDIB(id);
  if (!dib) {
    RecordAction(base::UserMetricsAction("BadMessageTerminate_RWH6"));
    GetProcess()->ReceivedBadMessage();
    return;
  }

  DCHECK(dib->memory());
  DCHECK(dib->size() == SkBitmap::ComputeSize(SkBitmap::kARGB_8888_Config,
                                              size.width(), size.height()));

  SkBitmap zoomed_bitmap;
  zoomed_bitmap.setConfig(SkBitmap::kARGB_8888_Config,
      size.width(), size.height());
  zoomed_bitmap.setPixels(dib->memory());

#if defined(OS_ANDROID)
  if (view_)
    view_->ShowDisambiguationPopup(rect, zoomed_bitmap);
#else
  NOTIMPLEMENTED();
#endif

  zoomed_bitmap.setPixels(0);
  Send(new ViewMsg_ReleaseDisambiguationPopupDIB(GetRoutingID(),
                                                 dib->handle()));
}

#if defined(OS_WIN)
void RenderWidgetHostImpl::OnWindowlessPluginDummyWindowCreated(
    gfx::NativeViewId dummy_activation_window) {
  HWND hwnd = reinterpret_cast<HWND>(dummy_activation_window);

  // This may happen as a result of a race condition when the plugin is going
  // away.
  wchar_t window_title[MAX_PATH + 1] = {0};
  if (!IsWindow(hwnd) ||
      !GetWindowText(hwnd, window_title, arraysize(window_title)) ||
      lstrcmpiW(window_title, kDummyActivationWindowName) != 0) {
    return;
  }

#if defined(USE_AURA)
  SetParent(hwnd,
            reinterpret_cast<HWND>(view_->GetParentForWindowlessPlugin()));
#else
  SetParent(hwnd, reinterpret_cast<HWND>(GetNativeViewId()));
#endif
  dummy_windows_for_activation_.push_back(hwnd);
}

void RenderWidgetHostImpl::OnWindowlessPluginDummyWindowDestroyed(
    gfx::NativeViewId dummy_activation_window) {
  HWND hwnd = reinterpret_cast<HWND>(dummy_activation_window);
  std::list<HWND>::iterator i = dummy_windows_for_activation_.begin();
  for (; i != dummy_windows_for_activation_.end(); ++i) {
    if ((*i) == hwnd) {
      dummy_windows_for_activation_.erase(i);
      return;
    }
  }
  NOTREACHED() << "Unknown dummy window";
}
#endif

bool RenderWidgetHostImpl::PaintBackingStoreRect(
    TransportDIB::Id bitmap,
    const gfx::Rect& bitmap_rect,
    const std::vector<gfx::Rect>& copy_rects,
    const gfx::Size& view_size,
    float scale_factor,
    const base::Closure& completion_callback) {
  // The view may be destroyed already.
  if (!view_)
    return false;

  if (is_hidden_) {
    // Don't bother updating the backing store when we're hidden. Just mark it
    // as being totally invalid. This will cause a complete repaint when the
    // view is restored.
    needs_repainting_on_restore_ = true;
    return false;
  }

  bool needs_full_paint = false;
  bool scheduled_completion_callback = false;
  BackingStoreManager::PrepareBackingStore(this, view_size, bitmap, bitmap_rect,
                                           copy_rects, scale_factor,
                                           completion_callback,
                                           &needs_full_paint,
                                           &scheduled_completion_callback);
  if (needs_full_paint) {
    repaint_start_time_ = TimeTicks::Now();
    DCHECK(!repaint_ack_pending_);
    repaint_ack_pending_ = true;
    TRACE_EVENT_ASYNC_BEGIN0(
        "renderer_host", "RenderWidgetHostImpl::repaint_ack_pending_", this);
    Send(new ViewMsg_Repaint(routing_id_, view_size));
  }

  return scheduled_completion_callback;
}

void RenderWidgetHostImpl::ScrollBackingStoreRect(const gfx::Vector2d& delta,
                                                  const gfx::Rect& clip_rect,
                                                  const gfx::Size& view_size) {
  if (is_hidden_) {
    // Don't bother updating the backing store when we're hidden. Just mark it
    // as being totally invalid. This will cause a complete repaint when the
    // view is restored.
    needs_repainting_on_restore_ = true;
    return;
  }

  // TODO(darin): do we need to do something else if our backing store is not
  // the same size as the advertised view?  maybe we just assume there is a
  // full paint on its way?
  BackingStore* backing_store = BackingStoreManager::Lookup(this);
  if (!backing_store || (backing_store->size() != view_size))
    return;
  backing_store->ScrollBackingStore(delta, clip_rect, view_size);
}

void RenderWidgetHostImpl::SetIgnoreInputEvents(bool ignore_input_events) {
  ignore_input_events_ = ignore_input_events;
}

bool RenderWidgetHostImpl::KeyPressListenersHandleEvent(
    const NativeWebKeyboardEvent& event) {
  if (event.skip_in_browser || event.type != WebKeyboardEvent::RawKeyDown)
    return false;

  for (size_t i = 0; i < key_press_event_callbacks_.size(); i++) {
    size_t original_size = key_press_event_callbacks_.size();
    if (key_press_event_callbacks_[i].Run(event))
      return true;

    // Check whether the callback that just ran removed itself, in which case
    // the iterator needs to be decremented to properly account for the removal.
    size_t current_size = key_press_event_callbacks_.size();
    if (current_size != original_size) {
      DCHECK_EQ(original_size - 1, current_size);
      --i;
    }
  }

  return false;
}

InputEventAckState RenderWidgetHostImpl::FilterInputEvent(
    const blink::WebInputEvent& event, const ui::LatencyInfo& latency_info) {
  // Don't ignore touch cancel events, since they may be sent while input
  // events are being ignored in order to keep the renderer from getting
  // confused about how many touches are active.
  if (IgnoreInputEvents() && event.type != WebInputEvent::TouchCancel)
    return INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS;

  if (!process_->HasConnection())
    return INPUT_EVENT_ACK_STATE_UNKNOWN;

  if (event.type == WebInputEvent::MouseDown)
    OnUserGesture();

  return view_ ? view_->FilterInputEvent(event)
               : INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
}

void RenderWidgetHostImpl::IncrementInFlightEventCount() {
  StartHangMonitorTimeout(
      TimeDelta::FromMilliseconds(hung_renderer_delay_ms_));
  increment_in_flight_event_count();
}

void RenderWidgetHostImpl::DecrementInFlightEventCount() {
  DCHECK(in_flight_event_count_ >= 0);
  // Cancel pending hung renderer checks since the renderer is responsive.
  if (decrement_in_flight_event_count() <= 0)
    StopHangMonitorTimeout();
}

void RenderWidgetHostImpl::OnHasTouchEventHandlers(bool has_handlers) {
  has_touch_handler_ = has_handlers;
}

OverscrollController* RenderWidgetHostImpl::GetOverscrollController() const {
  return overscroll_controller_.get();
}

void RenderWidgetHostImpl::DidFlush() {
  if (synthetic_gesture_controller_)
    synthetic_gesture_controller_->OnDidFlushInput();
  if (view_)
    view_->OnDidFlushInput();
}

void RenderWidgetHostImpl::OnKeyboardEventAck(
      const NativeWebKeyboardEvent& event,
      InputEventAckState ack_result) {
#if defined(OS_MACOSX)
  if (!is_hidden() && view_ && view_->PostProcessEventForPluginIme(event))
    return;
#endif

  // We only send unprocessed key event upwards if we are not hidden,
  // because the user has moved away from us and no longer expect any effect
  // of this key event.
  const bool processed = (INPUT_EVENT_ACK_STATE_CONSUMED == ack_result);
  if (delegate_ && !processed && !is_hidden() && !event.skip_in_browser) {
    delegate_->HandleKeyboardEvent(event);

    // WARNING: This RenderWidgetHostImpl can be deallocated at this point
    // (i.e.  in the case of Ctrl+W, where the call to
    // HandleKeyboardEvent destroys this RenderWidgetHostImpl).
  }
}

void RenderWidgetHostImpl::OnWheelEventAck(
    const MouseWheelEventWithLatencyInfo& wheel_event,
    InputEventAckState ack_result) {
  if (!wheel_event.latency.FindLatency(
          ui::INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_COMPONENT, 0, NULL)) {
    // MouseWheelEvent latency ends when it is acked but does not cause any
    // rendering scheduled.
    ui::LatencyInfo latency = wheel_event.latency;
    latency.AddLatencyNumber(
        ui::INPUT_EVENT_LATENCY_TERMINATED_MOUSE_COMPONENT, 0, 0);
  }

  const bool processed = (INPUT_EVENT_ACK_STATE_CONSUMED == ack_result);
  if (!processed && !is_hidden() && view_) {
    if (!delegate_->HandleWheelEvent(wheel_event.event))
      view_->UnhandledWheelEvent(wheel_event.event);
  }
}

void RenderWidgetHostImpl::OnGestureEventAck(
    const GestureEventWithLatencyInfo& event,
    InputEventAckState ack_result) {
  if (!event.latency.FindLatency(
          ui::INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_COMPONENT, 0, NULL)) {
    // GestureEvent latency ends when it is acked but does not cause any
    // rendering scheduled.
    ui::LatencyInfo latency = event.latency;
    latency.AddLatencyNumber(
        ui::INPUT_EVENT_LATENCY_TERMINATED_GESTURE_COMPONENT, 0 ,0);
  }

  if (ack_result != INPUT_EVENT_ACK_STATE_CONSUMED) {
    if (delegate_->HandleGestureEvent(event.event))
      ack_result = INPUT_EVENT_ACK_STATE_CONSUMED;
  }

  if (view_)
    view_->GestureEventAck(event.event, ack_result);
}

void RenderWidgetHostImpl::OnTouchEventAck(
    const TouchEventWithLatencyInfo& event,
    InputEventAckState ack_result) {
  TouchEventWithLatencyInfo touch_event = event;
  touch_event.latency.AddLatencyNumber(
      ui::INPUT_EVENT_LATENCY_ACKED_TOUCH_COMPONENT, 0, 0);
  // TouchEvent latency ends at ack if it didn't cause any rendering.
  if (!touch_event.latency.FindLatency(
          ui::INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_COMPONENT, 0, NULL)) {
    touch_event.latency.AddLatencyNumber(
        ui::INPUT_EVENT_LATENCY_TERMINATED_TOUCH_COMPONENT, 0, 0);
  }
  ComputeTouchLatency(touch_event.latency);
  if (view_)
    view_->ProcessAckedTouchEvent(touch_event, ack_result);
}

void RenderWidgetHostImpl::OnUnexpectedEventAck(UnexpectedEventAckType type) {
  if (type == BAD_ACK_MESSAGE) {
    RecordAction(base::UserMetricsAction("BadMessageTerminate_RWH2"));
    process_->ReceivedBadMessage();
  } else if (type == UNEXPECTED_EVENT_TYPE) {
    suppress_next_char_events_ = false;
  }
}

void RenderWidgetHostImpl::OnSyntheticGestureCompleted(
    SyntheticGesture::Result result) {
  Send(new InputMsg_SyntheticGestureCompleted(GetRoutingID()));
}

const gfx::Vector2d& RenderWidgetHostImpl::GetLastScrollOffset() const {
  return last_scroll_offset_;
}

bool RenderWidgetHostImpl::IgnoreInputEvents() const {
  return ignore_input_events_ || process_->IgnoreInputEvents();
}

bool RenderWidgetHostImpl::ShouldForwardTouchEvent() const {
  return input_router_->ShouldForwardTouchEvent();
}

void RenderWidgetHostImpl::StartUserGesture() {
  OnUserGesture();
}

void RenderWidgetHostImpl::Stop() {
  Send(new ViewMsg_Stop(GetRoutingID()));
}

void RenderWidgetHostImpl::SetBackground(const SkBitmap& background) {
  Send(new ViewMsg_SetBackground(GetRoutingID(), background));
}

void RenderWidgetHostImpl::SetEditCommandsForNextKeyEvent(
    const std::vector<EditCommand>& commands) {
  Send(new InputMsg_SetEditCommandsForNextKeyEvent(GetRoutingID(), commands));
}

void RenderWidgetHostImpl::AddAccessibilityMode(AccessibilityMode mode) {
  SetAccessibilityMode(
      content::AddAccessibilityModeTo(accessibility_mode_, mode));
}

void RenderWidgetHostImpl::RemoveAccessibilityMode(AccessibilityMode mode) {
  SetAccessibilityMode(
      content::RemoveAccessibilityModeFrom(accessibility_mode_, mode));
}

void RenderWidgetHostImpl::ResetAccessibilityMode() {
  SetAccessibilityMode(
      BrowserAccessibilityStateImpl::GetInstance()->accessibility_mode());
}

void RenderWidgetHostImpl::SetAccessibilityMode(AccessibilityMode mode) {
  accessibility_mode_ = mode;
  Send(new ViewMsg_SetAccessibilityMode(GetRoutingID(), mode));
}

void RenderWidgetHostImpl::AccessibilityDoDefaultAction(int object_id) {
  Send(new AccessibilityMsg_DoDefaultAction(GetRoutingID(), object_id));
}

void RenderWidgetHostImpl::AccessibilitySetFocus(int object_id) {
  Send(new AccessibilityMsg_SetFocus(GetRoutingID(), object_id));
}

void RenderWidgetHostImpl::AccessibilityScrollToMakeVisible(
    int acc_obj_id, gfx::Rect subfocus) {
  Send(new AccessibilityMsg_ScrollToMakeVisible(
      GetRoutingID(), acc_obj_id, subfocus));
}

void RenderWidgetHostImpl::AccessibilityScrollToPoint(
    int acc_obj_id, gfx::Point point) {
  Send(new AccessibilityMsg_ScrollToPoint(
      GetRoutingID(), acc_obj_id, point));
}

void RenderWidgetHostImpl::AccessibilitySetTextSelection(
    int object_id, int start_offset, int end_offset) {
  Send(new AccessibilityMsg_SetTextSelection(
      GetRoutingID(), object_id, start_offset, end_offset));
}

void RenderWidgetHostImpl::FatalAccessibilityTreeError() {
  Send(new AccessibilityMsg_FatalError(GetRoutingID()));
}

#if defined(OS_WIN)
void RenderWidgetHostImpl::SetParentNativeViewAccessible(
    gfx::NativeViewAccessible accessible_parent) {
  if (view_)
    view_->SetParentNativeViewAccessible(accessible_parent);
}

gfx::NativeViewAccessible
RenderWidgetHostImpl::GetParentNativeViewAccessible() const {
  return delegate_->GetParentNativeViewAccessible();
}
#endif

void RenderWidgetHostImpl::ExecuteEditCommand(const std::string& command,
                                              const std::string& value) {
  Send(new InputMsg_ExecuteEditCommand(GetRoutingID(), command, value));
}

void RenderWidgetHostImpl::ScrollFocusedEditableNodeIntoRect(
    const gfx::Rect& rect) {
  Send(new InputMsg_ScrollFocusedEditableNodeIntoRect(GetRoutingID(), rect));
}

void RenderWidgetHostImpl::MoveCaret(const gfx::Point& point) {
  Send(new InputMsg_MoveCaret(GetRoutingID(), point));
}

bool RenderWidgetHostImpl::GotResponseToLockMouseRequest(bool allowed) {
  if (!allowed) {
    RejectMouseLockOrUnlockIfNecessary();
    return false;
  } else {
    if (!pending_mouse_lock_request_) {
      // This is possible, e.g., the plugin sends us an unlock request before
      // the user allows to lock to mouse.
      return false;
    }

    pending_mouse_lock_request_ = false;
    if (!view_ || !view_->HasFocus()|| !view_->LockMouse()) {
      Send(new ViewMsg_LockMouse_ACK(routing_id_, false));
      return false;
    } else {
      Send(new ViewMsg_LockMouse_ACK(routing_id_, true));
      return true;
    }
  }
}

// static
void RenderWidgetHostImpl::AcknowledgeBufferPresent(
    int32 route_id, int gpu_host_id,
    const AcceleratedSurfaceMsg_BufferPresented_Params& params) {
  GpuProcessHostUIShim* ui_shim = GpuProcessHostUIShim::FromID(gpu_host_id);
  if (ui_shim) {
    ui_shim->Send(new AcceleratedSurfaceMsg_BufferPresented(route_id,
                                                            params));
  }
}

// static
void RenderWidgetHostImpl::SendSwapCompositorFrameAck(
    int32 route_id,
    uint32 output_surface_id,
    int renderer_host_id,
    const cc::CompositorFrameAck& ack) {
  RenderProcessHost* host = RenderProcessHost::FromID(renderer_host_id);
  if (!host)
    return;
  host->Send(new ViewMsg_SwapCompositorFrameAck(
      route_id, output_surface_id, ack));
}

// static
void RenderWidgetHostImpl::SendReclaimCompositorResources(
    int32 route_id,
    uint32 output_surface_id,
    int renderer_host_id,
    const cc::CompositorFrameAck& ack) {
  RenderProcessHost* host = RenderProcessHost::FromID(renderer_host_id);
  if (!host)
    return;
  host->Send(
      new ViewMsg_ReclaimCompositorResources(route_id, output_surface_id, ack));
}

void RenderWidgetHostImpl::AcknowledgeSwapBuffersToRenderer() {
  if (!is_threaded_compositing_enabled_)
    Send(new ViewMsg_SwapBuffers_ACK(routing_id_));
}

void RenderWidgetHostImpl::DelayedAutoResized() {
  gfx::Size new_size = new_auto_size_;
  // Clear the new_auto_size_ since the empty value is used as a flag to
  // indicate that no callback is in progress (i.e. without this line
  // DelayedAutoResized will not get called again).
  new_auto_size_.SetSize(0, 0);
  if (!should_auto_resize_)
    return;

  OnRenderAutoResized(new_size);
}

void RenderWidgetHostImpl::DetachDelegate() {
  delegate_ = NULL;
}

void RenderWidgetHostImpl::ComputeTouchLatency(
    const ui::LatencyInfo& latency_info) {
  ui::LatencyInfo::LatencyComponent ui_component;
  ui::LatencyInfo::LatencyComponent rwh_component;
  ui::LatencyInfo::LatencyComponent acked_component;

  if (!latency_info.FindLatency(ui::INPUT_EVENT_LATENCY_UI_COMPONENT,
                                0,
                                &ui_component) ||
      !latency_info.FindLatency(ui::INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT,
                                GetLatencyComponentId(),
                                &rwh_component))
    return;

  DCHECK(ui_component.event_count == 1);
  DCHECK(rwh_component.event_count == 1);

  base::TimeDelta ui_delta =
      rwh_component.event_time - ui_component.event_time;
  UMA_HISTOGRAM_CUSTOM_COUNTS(
      "Event.Latency.Browser.TouchUI",
      ui_delta.InMicroseconds(),
      1,
      20000,
      100);

  if (latency_info.FindLatency(ui::INPUT_EVENT_LATENCY_ACKED_TOUCH_COMPONENT,
                               0,
                               &acked_component)) {
    DCHECK(acked_component.event_count == 1);
    base::TimeDelta acked_delta =
        acked_component.event_time - rwh_component.event_time;
    UMA_HISTOGRAM_CUSTOM_COUNTS(
        "Event.Latency.Browser.TouchAcked",
        acked_delta.InMicroseconds(),
        1,
        1000000,
        100);
  }
}

void RenderWidgetHostImpl::FrameSwapped(const ui::LatencyInfo& latency_info) {
  ui::LatencyInfo::LatencyComponent window_snapshot_component;
  if (latency_info.FindLatency(ui::WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT,
                               GetLatencyComponentId(),
                               &window_snapshot_component)) {
    WindowSnapshotReachedScreen(
        static_cast<int>(window_snapshot_component.sequence_number));
  }

  ui::LatencyInfo::LatencyComponent rwh_component;
  ui::LatencyInfo::LatencyComponent swap_component;
  if (!latency_info.FindLatency(ui::INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT,
                                GetLatencyComponentId(),
                                &rwh_component) ||
      !latency_info.FindLatency(
          ui::INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT,
          0, &swap_component)) {
    return;
  }

  ui::LatencyInfo::LatencyComponent original_component;
  if (latency_info.FindLatency(
          ui::INPUT_EVENT_LATENCY_SCROLL_UPDATE_ORIGINAL_COMPONENT,
          GetLatencyComponentId(),
          &original_component)) {
    // This UMA metric tracks the time from when the original touch event is
    // created (averaged if there are multiple) to when the scroll gesture
    // results in final frame swap.
    base::TimeDelta delta =
        swap_component.event_time - original_component.event_time;
    for (size_t i = 0; i < original_component.event_count; i++) {
      UMA_HISTOGRAM_CUSTOM_COUNTS(
          "Event.Latency.TouchToScrollUpdateSwap",
          delta.InMicroseconds(),
          1,
          1000000,
          100);
    }
  }
}

void RenderWidgetHostImpl::DidReceiveRendererFrame() {
  view_->DidReceiveRendererFrame();
}

void RenderWidgetHostImpl::WindowSnapshotAsyncCallback(
    int routing_id,
    int snapshot_id,
    gfx::Size snapshot_size,
    scoped_refptr<base::RefCountedBytes> png_data) {
  if (!png_data) {
    std::vector<unsigned char> png_vector;
    Send(new ViewMsg_WindowSnapshotCompleted(
        routing_id, snapshot_id, gfx::Size(), png_vector));
    return;
  }

  Send(new ViewMsg_WindowSnapshotCompleted(
      routing_id, snapshot_id, snapshot_size, png_data->data()));
}

void RenderWidgetHostImpl::WindowSnapshotReachedScreen(int snapshot_id) {
  DCHECK(base::MessageLoopForUI::IsCurrent());

  std::vector<unsigned char> png;

  // This feature is behind the kEnableGpuBenchmarking command line switch
  // because it poses security concerns and should only be used for testing.
  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
  if (!command_line.HasSwitch(cc::switches::kEnableGpuBenchmarking)) {
    Send(new ViewMsg_WindowSnapshotCompleted(
        GetRoutingID(), snapshot_id, gfx::Size(), png));
    return;
  }

  gfx::Rect view_bounds = GetView()->GetViewBounds();
  gfx::Rect snapshot_bounds(view_bounds.size());
  gfx::Size snapshot_size = snapshot_bounds.size();

  if (ui::GrabViewSnapshot(
          GetView()->GetNativeView(), &png, snapshot_bounds)) {
    Send(new ViewMsg_WindowSnapshotCompleted(
        GetRoutingID(), snapshot_id, snapshot_size, png));
    return;
  }

  ui::GrabViewSnapshotAsync(
      GetView()->GetNativeView(),
      snapshot_bounds,
      base::ThreadTaskRunnerHandle::Get(),
      base::Bind(&RenderWidgetHostImpl::WindowSnapshotAsyncCallback,
                 weak_factory_.GetWeakPtr(),
                 GetRoutingID(),
                 snapshot_id,
                 snapshot_size));
}

// static
void RenderWidgetHostImpl::CompositorFrameDrawn(
    const std::vector<ui::LatencyInfo>& latency_info) {
  for (size_t i = 0; i < latency_info.size(); i++) {
    std::set<RenderWidgetHostImpl*> rwhi_set;
    for (ui::LatencyInfo::LatencyMap::const_iterator b =
             latency_info[i].latency_components.begin();
         b != latency_info[i].latency_components.end();
         ++b) {
      if (b->first.first == ui::INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT ||
          b->first.first == ui::WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT) {
        // Matches with GetLatencyComponentId
        int routing_id = b->first.second & 0xffffffff;
        int process_id = (b->first.second >> 32) & 0xffffffff;
        RenderWidgetHost* rwh =
            RenderWidgetHost::FromID(process_id, routing_id);
        if (!rwh) {
          continue;
        }
        RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(rwh);
        if (rwhi_set.insert(rwhi).second)
          rwhi->FrameSwapped(latency_info[i]);
      }
    }
  }
}

void RenderWidgetHostImpl::AddLatencyInfoComponentIds(
    ui::LatencyInfo* latency_info) {
  ui::LatencyInfo::LatencyMap new_components;
  ui::LatencyInfo::LatencyMap::iterator lc =
      latency_info->latency_components.begin();
  while (lc != latency_info->latency_components.end()) {
    ui::LatencyComponentType component_type = lc->first.first;
    if (component_type == ui::WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT) {
      // Generate a new component entry with the correct component ID
      ui::LatencyInfo::LatencyMap::key_type key =
          std::make_pair(component_type, GetLatencyComponentId());
      new_components[key] = lc->second;

      // Remove the old entry
      latency_info->latency_components.erase(lc++);
    } else {
      ++lc;
    }
  }

  // Add newly generated components into the latency info
  for (lc = new_components.begin(); lc != new_components.end(); ++lc) {
    latency_info->latency_components[lc->first] = lc->second;
  }
}

SkBitmap::Config RenderWidgetHostImpl::PreferredReadbackFormat() {
  if (view_)
    return view_->PreferredReadbackFormat();
  return SkBitmap::kARGB_8888_Config;
}

}  // namespace content