content/browser/renderer_host/render_view_host

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This source file includes following definitions.
WebTextDirectionToChromeTextDirection
DismissVirtualKeyboardTask
IsRVHStateActive
FromID
From
FromID
weak_factory_
GetDelegate
GetSiteInstance
CreateRenderView
IsRenderViewLive
SyncRendererPrefs
GetWebkitPrefs
Navigate
NavigateToURL
SetNavigationsSuspended
CancelSuspendedNavigations
SuppressDialogsUntilSwapOut
OnSwappedOut
WasSwappedOut
SetPendingShutdown
ClosePage
ClosePageIgnoringUnloadEvents
HasPendingCrossSiteRequest
SetHasPendingCrossSiteRequest
ActivateNearestFindResult
RequestFindMatchRects
DisableFullscreenEncryptedMediaPlayback
SetWebUIHandle
DragTargetDragEnter
DragTargetDragOver
DragTargetDragLeave
DragTargetDrop
DesktopNotificationPermissionRequestDone
DesktopNotificationPostDisplay
DesktopNotificationPostError
DesktopNotificationPostClose
DesktopNotificationPostClick
JavaScriptDialogClosed
DragSourceEndedAt
DragSourceSystemDragEnded
GetMainFrame
AllowBindings
GetEnabledBindings
SetWebUIProperty
GotFocus
LostCapture
LostMouseLock
SetInitialFocus
FilesSelectedInChooser
DirectoryEnumerationFinished
LoadStateChanged
SuddenTerminationAllowed
OnMessageReceived
Init
Shutdown
IsRenderView
CreateNewWindow
CreateNewWidget
CreateNewFullscreenWidget
OnShowView
OnShowWidget
OnShowFullscreenWidget
OnRunModal
OnRenderViewReady
OnRenderProcessGone
OnUpdateState
OnUpdateTitle
OnUpdateEncoding
OnUpdateTargetURL
OnUpdateInspectorSetting
OnClose
OnRequestMove
OnDidChangeLoadProgress
OnDidDisownOpener
OnDocumentAvailableInMainFrame
OnDocumentOnLoadCompletedInMainFrame
OnToggleFullscreen
OnDidContentsPreferredSizeChange
OnRenderAutoResized
OnDidChangeScrollOffset
OnDidChangeScrollbarsForMainFrame
OnDidChangeScrollOffsetPinningForMainFrame
OnDidChangeNumWheelEvents
OnSelectionRootBoundsChanged
OnRouteCloseEvent
OnRouteMessageEvent
OnRunJavaScriptMessage
OnRunBeforeUnloadConfirm
OnStartDragging
OnUpdateDragCursor
OnTargetDropACK
OnTakeFocus
OnFocusedNodeChanged
OnUserGesture
OnClosePageACK
NotifyRendererUnresponsive
NotifyRendererResponsive
RequestToLockMouse
IsFullscreen
OnFocus
OnBlur
GetRootWindowResizerRect
ForwardMouseEvent
OnPointerEventActivate
ForwardKeyboardEvent
DidSelectPopupMenuItems
DidCancelPopupMenu
DidSelectPopupMenuItem
DidCancelPopupMenu
SendOrientationChangeEvent
ToggleSpeechInput
IsWaitingForUnloadACK
ExitFullscreen
GetWebkitPreferences
DisownOpener
SetAccessibilityCallbackForTesting
UpdateWebkitPreferences
GetAudioOutputControllers
ClearFocusedElement
Zoom
DisableScrollbarsForThreshold
EnablePreferredSizeMode
EnableAutoResize
DisableAutoResize
CopyImageAt
ExecuteMediaPlayerActionAtLocation
ExecutePluginActionAtLocation
NotifyMoveOrResizeStarted
OnAccessibilityEvents
OnAccessibilityLocationChanges
OnDidZoomURL
OnRequestDesktopNotificationPermission
OnShowDesktopNotification
OnCancelDesktopNotification
OnRunFileChooser
OnDidAccessInitialDocument
OnFocusedNodeTouched
OnShowPopup
OnHidePopup
SetState
CanAccessFilesOfPageState
AttachToFrameTree
// 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_view_host_impl.h"

#include <set>
#include <string>
#include <utility>
#include <vector>

#include "base/callback.h"
#include "base/command_line.h"
#include "base/debug/trace_event.h"
#include "base/i18n/rtl.h"
#include "base/json/json_reader.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/histogram.h"
#include "base/stl_util.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/sys_info.h"
#include "base/time/time.h"
#include "base/values.h"
#include "cc/base/switches.h"
#include "content/browser/accessibility/browser_accessibility_manager.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/browser/cross_site_request_manager.h"
#include "content/browser/dom_storage/session_storage_namespace_impl.h"
#include "content/browser/frame_host/frame_tree.h"
#include "content/browser/gpu/compositor_util.h"
#include "content/browser/gpu/gpu_data_manager_impl.h"
#include "content/browser/gpu/gpu_process_host.h"
#include "content/browser/gpu/gpu_surface_tracker.h"
#include "content/browser/host_zoom_map_impl.h"
#include "content/browser/loader/resource_dispatcher_host_impl.h"
#include "content/browser/renderer_host/dip_util.h"
#include "content/browser/renderer_host/input/timeout_monitor.h"
#include "content/browser/renderer_host/media/audio_renderer_host.h"
#include "content/browser/renderer_host/render_process_host_impl.h"
#include "content/browser/renderer_host/render_view_host_delegate.h"
#include "content/common/accessibility_messages.h"
#include "content/common/browser_plugin/browser_plugin_messages.h"
#include "content/common/content_switches_internal.h"
#include "content/common/desktop_notification_messages.h"
#include "content/common/drag_messages.h"
#include "content/common/frame_messages.h"
#include "content/common/input_messages.h"
#include "content/common/inter_process_time_ticks_converter.h"
#include "content/common/speech_recognition_messages.h"
#include "content/common/swapped_out_messages.h"
#include "content/common/view_messages.h"
#include "content/port/browser/render_view_host_delegate_view.h"
#include "content/port/browser/render_widget_host_view_port.h"
#include "content/public/browser/ax_event_notification_details.h"
#include "content/public/browser/browser_accessibility_state.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_message_filter.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/native_web_keyboard_event.h"
#include "content/public/browser/notification_details.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_types.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/render_widget_host_iterator.h"
#include "content/public/browser/user_metrics.h"
#include "content/public/common/bindings_policy.h"
#include "content/public/common/content_constants.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/context_menu_params.h"
#include "content/public/common/drop_data.h"
#include "content/public/common/result_codes.h"
#include "content/public/common/url_constants.h"
#include "content/public/common/url_utils.h"
#include "net/base/net_util.h"
#include "net/base/network_change_notifier.h"
#include "net/url_request/url_request_context_getter.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/accessibility/ax_tree.h"
#include "ui/base/touch/touch_device.h"
#include "ui/base/touch/touch_enabled.h"
#include "ui/base/ui_base_switches.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/native_theme/native_theme_switches.h"
#include "ui/shell_dialogs/selected_file_info.h"
#include "webkit/browser/fileapi/isolated_context.h"

#if defined(OS_MACOSX)
#include "content/browser/renderer_host/popup_menu_helper_mac.h"
#elif defined(OS_ANDROID)
#include "content/browser/media/android/browser_media_player_manager.h"
#elif defined(OS_WIN)
#include "base/win/win_util.h"
#endif

using base::TimeDelta;
using blink::WebConsoleMessage;
using blink::WebDragOperation;
using blink::WebDragOperationNone;
using blink::WebDragOperationsMask;
using blink::WebInputEvent;
using blink::WebMediaPlayerAction;
using blink::WebPluginAction;

namespace content {
namespace {

// Translate a WebKit text direction into a base::i18n one.
base::i18n::TextDirection WebTextDirectionToChromeTextDirection(
    blink::WebTextDirection dir) {
  switch (dir) {
    case blink::WebTextDirectionLeftToRight:
      return base::i18n::LEFT_TO_RIGHT;
    case blink::WebTextDirectionRightToLeft:
      return base::i18n::RIGHT_TO_LEFT;
    default:
      NOTREACHED();
      return base::i18n::UNKNOWN_DIRECTION;
  }
}

#if defined(OS_WIN)

const int kVirtualKeyboardDisplayWaitTimeoutMs = 100;
const int kMaxVirtualKeyboardDisplayRetries = 5;

void DismissVirtualKeyboardTask() {
  static int virtual_keyboard_display_retries = 0;
  // If the virtual keyboard is not yet visible, then we execute the task again
  // waiting for it to show up.
  if (!base::win::DismissVirtualKeyboard()) {
    if (virtual_keyboard_display_retries < kMaxVirtualKeyboardDisplayRetries) {
      BrowserThread::PostDelayedTask(
          BrowserThread::UI, FROM_HERE,
          base::Bind(base::IgnoreResult(&DismissVirtualKeyboardTask)),
          TimeDelta::FromMilliseconds(kVirtualKeyboardDisplayWaitTimeoutMs));
      ++virtual_keyboard_display_retries;
    } else {
      virtual_keyboard_display_retries = 0;
    }
  }
}
#endif

}  // namespace

// static
const int RenderViewHostImpl::kUnloadTimeoutMS = 1000;

///////////////////////////////////////////////////////////////////////////////
// RenderViewHost, public:

// static
bool RenderViewHostImpl::IsRVHStateActive(RenderViewHostImplState rvh_state) {
  if (rvh_state == STATE_DEFAULT ||
      rvh_state == STATE_WAITING_FOR_UNLOAD_ACK ||
      rvh_state == STATE_WAITING_FOR_COMMIT ||
      rvh_state == STATE_WAITING_FOR_CLOSE)
    return true;
  return false;
}

// static
RenderViewHost* RenderViewHost::FromID(int render_process_id,
                                       int render_view_id) {
  return RenderViewHostImpl::FromID(render_process_id, render_view_id);
}

// static
RenderViewHost* RenderViewHost::From(RenderWidgetHost* rwh) {
  DCHECK(rwh->IsRenderView());
  return static_cast<RenderViewHostImpl*>(RenderWidgetHostImpl::From(rwh));
}

///////////////////////////////////////////////////////////////////////////////
// RenderViewHostImpl, public:

// static
RenderViewHostImpl* RenderViewHostImpl::FromID(int render_process_id,
                                               int render_view_id) {
  RenderWidgetHost* widget =
      RenderWidgetHost::FromID(render_process_id, render_view_id);
  if (!widget || !widget->IsRenderView())
    return NULL;
  return static_cast<RenderViewHostImpl*>(RenderWidgetHostImpl::From(widget));
}

RenderViewHostImpl::RenderViewHostImpl(
    SiteInstance* instance,
    RenderViewHostDelegate* delegate,
    RenderWidgetHostDelegate* widget_delegate,
    int routing_id,
    int main_frame_routing_id,
    bool swapped_out,
    bool hidden)
    : RenderWidgetHostImpl(widget_delegate,
                           instance->GetProcess(),
                           routing_id,
                           hidden),
      frames_ref_count_(0),
      delegate_(delegate),
      instance_(static_cast<SiteInstanceImpl*>(instance)),
      waiting_for_drag_context_response_(false),
      enabled_bindings_(0),
      navigations_suspended_(false),
      has_accessed_initial_document_(false),
      main_frame_routing_id_(main_frame_routing_id),
      run_modal_reply_msg_(NULL),
      run_modal_opener_id_(MSG_ROUTING_NONE),
      is_waiting_for_beforeunload_ack_(false),
      unload_ack_is_for_cross_site_transition_(false),
      are_javascript_messages_suppressed_(false),
      sudden_termination_allowed_(false),
      render_view_termination_status_(base::TERMINATION_STATUS_STILL_RUNNING),
      virtual_keyboard_requested_(false),
      weak_factory_(this) {
  DCHECK(instance_.get());
  CHECK(delegate_);  // http://crbug.com/82827

  GetProcess()->EnableSendQueue();

  if (swapped_out) {
    rvh_state_ = STATE_SWAPPED_OUT;
  } else {
    rvh_state_ = STATE_DEFAULT;
    instance_->increment_active_view_count();
  }

  if (ResourceDispatcherHostImpl::Get()) {
    BrowserThread::PostTask(
        BrowserThread::IO, FROM_HERE,
        base::Bind(&ResourceDispatcherHostImpl::OnRenderViewHostCreated,
                   base::Unretained(ResourceDispatcherHostImpl::Get()),
                   GetProcess()->GetID(), GetRoutingID()));
  }

#if defined(OS_ANDROID)
  media_player_manager_.reset(BrowserMediaPlayerManager::Create(this));
#endif

  unload_event_monitor_timeout_.reset(new TimeoutMonitor(base::Bind(
      &RenderViewHostImpl::OnSwappedOut, weak_factory_.GetWeakPtr(), true)));
}

RenderViewHostImpl::~RenderViewHostImpl() {
  if (ResourceDispatcherHostImpl::Get()) {
    BrowserThread::PostTask(
        BrowserThread::IO, FROM_HERE,
        base::Bind(&ResourceDispatcherHostImpl::OnRenderViewHostDeleted,
                   base::Unretained(ResourceDispatcherHostImpl::Get()),
                   GetProcess()->GetID(), GetRoutingID()));
  }

  delegate_->RenderViewDeleted(this);

  // Be sure to clean up any leftover state from cross-site requests.
  CrossSiteRequestManager::GetInstance()->SetHasPendingCrossSiteRequest(
      GetProcess()->GetID(), GetRoutingID(), false);

  // If this was swapped out, it already decremented the active view
  // count of the SiteInstance it belongs to.
  if (IsRVHStateActive(rvh_state_))
    instance_->decrement_active_view_count();
}

RenderViewHostDelegate* RenderViewHostImpl::GetDelegate() const {
  return delegate_;
}

SiteInstance* RenderViewHostImpl::GetSiteInstance() const {
  return instance_.get();
}

bool RenderViewHostImpl::CreateRenderView(
    const base::string16& frame_name,
    int opener_route_id,
    int32 max_page_id) {
  TRACE_EVENT0("renderer_host", "RenderViewHostImpl::CreateRenderView");
  DCHECK(!IsRenderViewLive()) << "Creating view twice";

  // The process may (if we're sharing a process with another host that already
  // initialized it) or may not (we have our own process or the old process
  // crashed) have been initialized. Calling Init multiple times will be
  // ignored, so this is safe.
  if (!GetProcess()->Init())
    return false;
  DCHECK(GetProcess()->HasConnection());
  DCHECK(GetProcess()->GetBrowserContext());

  renderer_initialized_ = true;

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

  // Ensure the RenderView starts with a next_page_id larger than any existing
  // page ID it might be asked to render.
  int32 next_page_id = 1;
  if (max_page_id > -1)
    next_page_id = max_page_id + 1;

  ViewMsg_New_Params params;
  params.renderer_preferences =
      delegate_->GetRendererPrefs(GetProcess()->GetBrowserContext());
  params.web_preferences = delegate_->GetWebkitPrefs();
  params.view_id = GetRoutingID();
  params.main_frame_routing_id = main_frame_routing_id_;
  params.surface_id = surface_id();
  params.session_storage_namespace_id =
      delegate_->GetSessionStorageNamespace(instance_)->id();
  params.frame_name = frame_name;
  // Ensure the RenderView sets its opener correctly.
  params.opener_route_id = opener_route_id;
  params.swapped_out = !IsRVHStateActive(rvh_state_);
  params.hidden = is_hidden();
  params.next_page_id = next_page_id;
  GetWebScreenInfo(&params.screen_info);
  params.accessibility_mode = accessibility_mode();

  Send(new ViewMsg_New(params));

  // If it's enabled, tell the renderer to set up the Javascript bindings for
  // sending messages back to the browser.
  if (GetProcess()->IsGuest())
    DCHECK_EQ(0, enabled_bindings_);
  Send(new ViewMsg_AllowBindings(GetRoutingID(), enabled_bindings_));
  // Let our delegate know that we created a RenderView.
  delegate_->RenderViewCreated(this);

  return true;
}

bool RenderViewHostImpl::IsRenderViewLive() const {
  return GetProcess()->HasConnection() && renderer_initialized_;
}

void RenderViewHostImpl::SyncRendererPrefs() {
  Send(new ViewMsg_SetRendererPrefs(GetRoutingID(),
                                    delegate_->GetRendererPrefs(
                                        GetProcess()->GetBrowserContext())));
}

WebPreferences RenderViewHostImpl::GetWebkitPrefs(const GURL& url) {
  TRACE_EVENT0("browser", "RenderViewHostImpl::GetWebkitPrefs");
  WebPreferences prefs;

  const CommandLine& command_line = *CommandLine::ForCurrentProcess();

  prefs.javascript_enabled =
      !command_line.HasSwitch(switches::kDisableJavaScript);
  prefs.web_security_enabled =
      !command_line.HasSwitch(switches::kDisableWebSecurity);
  prefs.plugins_enabled =
      !command_line.HasSwitch(switches::kDisablePlugins);
  prefs.java_enabled =
      !command_line.HasSwitch(switches::kDisableJava);

  prefs.remote_fonts_enabled =
      !command_line.HasSwitch(switches::kDisableRemoteFonts);
  prefs.xslt_enabled =
      !command_line.HasSwitch(switches::kDisableXSLT);
  prefs.xss_auditor_enabled =
      !command_line.HasSwitch(switches::kDisableXSSAuditor);
  prefs.application_cache_enabled =
      !command_line.HasSwitch(switches::kDisableApplicationCache);

  prefs.local_storage_enabled =
      !command_line.HasSwitch(switches::kDisableLocalStorage);
  prefs.databases_enabled =
      !command_line.HasSwitch(switches::kDisableDatabases);
#if defined(OS_ANDROID)
  // WebAudio is enabled by default on x86 and ARM.
  prefs.webaudio_enabled =
      !command_line.HasSwitch(switches::kDisableWebAudio);
#endif

  prefs.experimental_webgl_enabled =
      GpuProcessHost::gpu_enabled() &&
      !command_line.HasSwitch(switches::kDisable3DAPIs) &&
      !command_line.HasSwitch(switches::kDisableExperimentalWebGL);

  prefs.pepper_3d_enabled =
      !command_line.HasSwitch(switches::kDisablePepper3d);

  prefs.flash_3d_enabled =
      GpuProcessHost::gpu_enabled() &&
      !command_line.HasSwitch(switches::kDisableFlash3d);
  prefs.flash_stage3d_enabled =
      GpuProcessHost::gpu_enabled() &&
      !command_line.HasSwitch(switches::kDisableFlashStage3d);
  prefs.flash_stage3d_baseline_enabled =
      GpuProcessHost::gpu_enabled() &&
      !command_line.HasSwitch(switches::kDisableFlashStage3d);

  prefs.gl_multisampling_enabled =
      !command_line.HasSwitch(switches::kDisableGLMultisampling);
  prefs.privileged_webgl_extensions_enabled =
      command_line.HasSwitch(switches::kEnablePrivilegedWebGLExtensions);
  prefs.site_specific_quirks_enabled =
      !command_line.HasSwitch(switches::kDisableSiteSpecificQuirks);
  prefs.allow_file_access_from_file_urls =
      command_line.HasSwitch(switches::kAllowFileAccessFromFiles);

  prefs.layer_squashing_enabled = false;
  if (command_line.HasSwitch(switches::kEnableLayerSquashing))
      prefs.layer_squashing_enabled = true;
  if (command_line.HasSwitch(switches::kDisableLayerSquashing))
      prefs.layer_squashing_enabled = false;

  prefs.show_paint_rects =
      command_line.HasSwitch(switches::kShowPaintRects);
  prefs.accelerated_compositing_enabled =
      GpuProcessHost::gpu_enabled() &&
      !command_line.HasSwitch(switches::kDisableAcceleratedCompositing);
  prefs.force_compositing_mode = content::IsForceCompositingModeEnabled();
  prefs.accelerated_2d_canvas_enabled =
      GpuProcessHost::gpu_enabled() &&
      !command_line.HasSwitch(switches::kDisableAccelerated2dCanvas);
  prefs.antialiased_2d_canvas_disabled =
      command_line.HasSwitch(switches::kDisable2dCanvasAntialiasing);
  prefs.accelerated_2d_canvas_msaa_sample_count =
      atoi(command_line.GetSwitchValueASCII(
      switches::kAcceleratedCanvas2dMSAASampleCount).c_str());
  prefs.deferred_filters_enabled =
      command_line.HasSwitch(switches::kEnableDeferredFilters);
  prefs.accelerated_compositing_for_3d_transforms_enabled =
      prefs.accelerated_compositing_for_animation_enabled =
          !command_line.HasSwitch(switches::kDisableAcceleratedLayers);
  prefs.accelerated_compositing_for_plugins_enabled = true;
  prefs.accelerated_compositing_for_video_enabled =
      !command_line.HasSwitch(switches::kDisableAcceleratedVideo);
  prefs.lazy_layout_enabled =
      command_line.HasSwitch(switches::kEnableExperimentalWebPlatformFeatures);
  prefs.region_based_columns_enabled =
      command_line.HasSwitch(switches::kEnableRegionBasedColumns);
  prefs.threaded_html_parser =
      !command_line.HasSwitch(switches::kDisableThreadedHTMLParser);
  prefs.experimental_websocket_enabled =
      command_line.HasSwitch(switches::kEnableExperimentalWebSocket);
  if (command_line.HasSwitch(cc::switches::kEnablePinchVirtualViewport)) {
    prefs.pinch_virtual_viewport_enabled = true;
    prefs.pinch_overlay_scrollbar_thickness = 10;
  }
  prefs.use_solid_color_scrollbars = ui::IsOverlayScrollbarEnabled();

#if defined(OS_ANDROID)
  prefs.user_gesture_required_for_media_playback = !command_line.HasSwitch(
      switches::kDisableGestureRequirementForMediaPlayback);
#endif

  prefs.touch_enabled = ui::AreTouchEventsEnabled();
  prefs.device_supports_touch = prefs.touch_enabled &&
      ui::IsTouchDevicePresent();
#if defined(OS_ANDROID)
  prefs.device_supports_mouse = false;
#endif

  prefs.pointer_events_max_touch_points = ui::MaxTouchPoints();

  prefs.touch_adjustment_enabled =
      !command_line.HasSwitch(switches::kDisableTouchAdjustment);
  prefs.compositor_touch_hit_testing =
      !command_line.HasSwitch(
           cc::switches::kDisableCompositorTouchHitTesting) &&
      !command_line.HasSwitch(switches::kEnableBleedingEdgeRenderingFastPaths);


#if defined(OS_MACOSX) || defined(OS_CHROMEOS)
  bool default_enable_scroll_animator = true;
#else
  bool default_enable_scroll_animator = false;
#endif
  prefs.enable_scroll_animator = default_enable_scroll_animator;
  if (command_line.HasSwitch(switches::kEnableSmoothScrolling))
    prefs.enable_scroll_animator = true;
  if (command_line.HasSwitch(switches::kDisableSmoothScrolling))
    prefs.enable_scroll_animator = false;

  prefs.visual_word_movement_enabled =
      command_line.HasSwitch(switches::kEnableVisualWordMovement);

  // Certain GPU features might have been blacklisted.
  GpuDataManagerImpl::GetInstance()->UpdateRendererWebPrefs(&prefs);

  if (ChildProcessSecurityPolicyImpl::GetInstance()->HasWebUIBindings(
          GetProcess()->GetID())) {
    prefs.loads_images_automatically = true;
    prefs.javascript_enabled = true;
  }

  prefs.is_online = !net::NetworkChangeNotifier::IsOffline();

  prefs.fixed_position_creates_stacking_context = !command_line.HasSwitch(
      switches::kDisableFixedPositionCreatesStackingContext);

  prefs.gesture_tap_highlight_enabled = !command_line.HasSwitch(
      switches::kDisableGestureTapHighlight);

  prefs.number_of_cpu_cores = base::SysInfo::NumberOfProcessors();

  prefs.viewport_meta_enabled =
      command_line.HasSwitch(switches::kEnableViewportMeta);

  prefs.viewport_enabled =
      command_line.HasSwitch(switches::kEnableViewport) ||
      prefs.viewport_meta_enabled;

  prefs.main_frame_resizes_are_orientation_changes =
      command_line.HasSwitch(switches::kMainFrameResizesAreOrientationChanges);

  prefs.deferred_image_decoding_enabled =
      command_line.HasSwitch(switches::kEnableDeferredImageDecoding) ||
      content::IsImplSidePaintingEnabled();

  prefs.spatial_navigation_enabled = command_line.HasSwitch(
      switches::kEnableSpatialNavigation);

  GetContentClient()->browser()->OverrideWebkitPrefs(this, url, &prefs);

  // Disable compositing in guests until we have compositing path implemented
  // for guests.
  bool guest_compositing_enabled = !command_line.HasSwitch(
      switches::kDisableBrowserPluginCompositing);
  if (GetProcess()->IsGuest() && !guest_compositing_enabled) {
    prefs.force_compositing_mode = false;
    prefs.accelerated_compositing_enabled = false;
  }

  return prefs;
}

void RenderViewHostImpl::Navigate(const FrameMsg_Navigate_Params& params) {
  TRACE_EVENT0("renderer_host", "RenderViewHostImpl::Navigate");
  delegate_->GetFrameTree()->GetMainFrame()->Navigate(params);
}

void RenderViewHostImpl::NavigateToURL(const GURL& url) {
  delegate_->GetFrameTree()->GetMainFrame()->NavigateToURL(url);
}

void RenderViewHostImpl::SetNavigationsSuspended(
    bool suspend,
    const base::TimeTicks& proceed_time) {
  // This should only be called to toggle the state.
  DCHECK(navigations_suspended_ != suspend);

  navigations_suspended_ = suspend;
  if (!suspend && suspended_nav_params_) {
    // There's navigation message params waiting to be sent.  Now that we're not
    // suspended anymore, resume navigation by sending them.  If we were swapped
    // out, we should also stop filtering out the IPC messages now.
    SetState(STATE_DEFAULT);

    DCHECK(!proceed_time.is_null());
    suspended_nav_params_->browser_navigation_start = proceed_time;
    Send(new FrameMsg_Navigate(
        main_frame_routing_id_, *suspended_nav_params_.get()));
    suspended_nav_params_.reset();
  }
}

void RenderViewHostImpl::CancelSuspendedNavigations() {
  // Clear any state if a pending navigation is canceled or pre-empted.
  if (suspended_nav_params_)
    suspended_nav_params_.reset();
  navigations_suspended_ = false;
}

void RenderViewHostImpl::SuppressDialogsUntilSwapOut() {
  Send(new ViewMsg_SuppressDialogsUntilSwapOut(GetRoutingID()));
}

void RenderViewHostImpl::OnSwappedOut(bool timed_out) {
  // Ignore spurious swap out ack.
  if (!IsWaitingForUnloadACK())
    return;
  unload_event_monitor_timeout_->Stop();
  if (timed_out) {
    base::ProcessHandle process_handle = GetProcess()->GetHandle();
    int views = 0;

    // Count the number of active widget hosts for the process, which
    // is equivalent to views using the process as of this writing.
    scoped_ptr<RenderWidgetHostIterator> widgets(
      RenderWidgetHost::GetRenderWidgetHosts());
    while (RenderWidgetHost* widget = widgets->GetNextHost()) {
      if (widget->GetProcess()->GetID() == GetProcess()->GetID())
        ++views;
    }

    if (!RenderProcessHost::run_renderer_in_process() &&
        process_handle && views <= 1) {
      // The process can safely be terminated, only if WebContents sets
      // SuddenTerminationAllowed, which indicates that the timer has expired.
      // This is not the case if we load data URLs or about:blank. The reason
      // is that those have no network requests and this code is hit without
      // setting the unresponsiveness timer. This allows a corner case where a
      // navigation to a data URL will leave a process running, if the
      // beforeunload handler completes fine, but the unload handler hangs.
      // At this time, the complexity to solve this edge case is not worthwhile.
      if (SuddenTerminationAllowed()) {
        // We should kill the process, but for now, just log the data so we can
        // diagnose the kill rate and investigate if separate timer is needed.
        // http://crbug.com/104346.

        // Log a histogram point to help us diagnose how many of those kills
        // we have performed. 1 is the enum value for RendererType Normal for
        // the histogram.
        UMA_HISTOGRAM_PERCENTAGE(
            "BrowserRenderProcessHost.ChildKillsUnresponsive", 1);
      }
    }
  }

  switch (rvh_state_) {
    case STATE_WAITING_FOR_UNLOAD_ACK:
      SetState(STATE_WAITING_FOR_COMMIT);
      break;
    case STATE_PENDING_SWAP_OUT:
      SetState(STATE_SWAPPED_OUT);
      break;
    case STATE_PENDING_SHUTDOWN:
      DCHECK(!pending_shutdown_on_swap_out_.is_null());
      pending_shutdown_on_swap_out_.Run();
      break;
    default:
      NOTREACHED();
  }
}

void RenderViewHostImpl::WasSwappedOut(
    const base::Closure& pending_delete_on_swap_out) {
  Send(new ViewMsg_WasSwappedOut(GetRoutingID()));
  if (rvh_state_ == STATE_WAITING_FOR_UNLOAD_ACK) {
    SetState(STATE_PENDING_SWAP_OUT);
    if (!instance_->active_view_count())
      SetPendingShutdown(pending_delete_on_swap_out);
  } else if (rvh_state_ == STATE_WAITING_FOR_COMMIT) {
    SetState(STATE_SWAPPED_OUT);
  } else if (rvh_state_ == STATE_DEFAULT) {
    // When the RenderView is not live, the RenderFrameHostManager will call
    // CommitPending directly, without calling SwapOut on the old RVH. This will
    // cause WasSwappedOut to be called directly on the live old RVH.
    DCHECK(!IsRenderViewLive());
    SetState(STATE_SWAPPED_OUT);
  } else {
    NOTREACHED();
  }
}

void RenderViewHostImpl::SetPendingShutdown(const base::Closure& on_swap_out) {
  pending_shutdown_on_swap_out_ = on_swap_out;
  SetState(STATE_PENDING_SHUTDOWN);
}

void RenderViewHostImpl::ClosePage() {
  SetState(STATE_WAITING_FOR_CLOSE);
  StartHangMonitorTimeout(TimeDelta::FromMilliseconds(kUnloadTimeoutMS));

  if (IsRenderViewLive()) {
    // Since we are sending an IPC message to the renderer, increase the event
    // count to prevent the hang monitor timeout from being stopped by input
    // event acknowledgements.
    increment_in_flight_event_count();

    // TODO(creis): Should this be moved to Shutdown?  It may not be called for
    // RenderViewHosts that have been swapped out.
    NotificationService::current()->Notify(
        NOTIFICATION_RENDER_VIEW_HOST_WILL_CLOSE_RENDER_VIEW,
        Source<RenderViewHost>(this),
        NotificationService::NoDetails());

    Send(new ViewMsg_ClosePage(GetRoutingID()));
  } else {
    // This RenderViewHost doesn't have a live renderer, so just skip the unload
    // event and close the page.
    ClosePageIgnoringUnloadEvents();
  }
}

void RenderViewHostImpl::ClosePageIgnoringUnloadEvents() {
  StopHangMonitorTimeout();
  is_waiting_for_beforeunload_ack_ = false;

  sudden_termination_allowed_ = true;
  delegate_->Close(this);
}

bool RenderViewHostImpl::HasPendingCrossSiteRequest() {
  return CrossSiteRequestManager::GetInstance()->HasPendingCrossSiteRequest(
      GetProcess()->GetID(), GetRoutingID());
}

void RenderViewHostImpl::SetHasPendingCrossSiteRequest(
    bool has_pending_request) {
  CrossSiteRequestManager::GetInstance()->SetHasPendingCrossSiteRequest(
      GetProcess()->GetID(), GetRoutingID(), has_pending_request);
}

#if defined(OS_ANDROID)
void RenderViewHostImpl::ActivateNearestFindResult(int request_id,
                                                   float x,
                                                   float y) {
  Send(new InputMsg_ActivateNearestFindResult(GetRoutingID(),
                                              request_id, x, y));
}

void RenderViewHostImpl::RequestFindMatchRects(int current_version) {
  Send(new ViewMsg_FindMatchRects(GetRoutingID(), current_version));
}

void RenderViewHostImpl::DisableFullscreenEncryptedMediaPlayback() {
  media_player_manager_->DisableFullscreenEncryptedMediaPlayback();
}
#endif

#if defined(USE_MOJO)
void RenderViewHostImpl::SetWebUIHandle(mojo::ScopedMessagePipeHandle handle) {
  // Never grant any bindings to browser plugin guests.
  if (GetProcess()->IsGuest()) {
    NOTREACHED() << "Never grant bindings to a guest process.";
    return;
  }

  if ((enabled_bindings_ & BINDINGS_POLICY_WEB_UI) == 0) {
    NOTREACHED() << "You must grant bindings before setting the handle";
    return;
  }

  DCHECK(renderer_initialized_);
  RenderProcessHostImpl* process =
      static_cast<RenderProcessHostImpl*>(GetProcess());
  process->SetWebUIHandle(GetRoutingID(), handle.Pass());
}
#endif

void RenderViewHostImpl::DragTargetDragEnter(
    const DropData& drop_data,
    const gfx::Point& client_pt,
    const gfx::Point& screen_pt,
    WebDragOperationsMask operations_allowed,
    int key_modifiers) {
  const int renderer_id = GetProcess()->GetID();
  ChildProcessSecurityPolicyImpl* policy =
      ChildProcessSecurityPolicyImpl::GetInstance();

  // The URL could have been cobbled together from any highlighted text string,
  // and can't be interpreted as a capability.
  DropData filtered_data(drop_data);
  GetProcess()->FilterURL(true, &filtered_data.url);
  if (drop_data.did_originate_from_renderer) {
    filtered_data.filenames.clear();
  }

  // The filenames vector, on the other hand, does represent a capability to
  // access the given files.
  fileapi::IsolatedContext::FileInfoSet files;
  for (std::vector<ui::FileInfo>::iterator iter(
           filtered_data.filenames.begin());
       iter != filtered_data.filenames.end();
       ++iter) {
    // A dragged file may wind up as the value of an input element, or it
    // may be used as the target of a navigation instead.  We don't know
    // which will happen at this point, so generously grant both access
    // and request permissions to the specific file to cover both cases.
    // We do not give it the permission to request all file:// URLs.

    // Make sure we have the same display_name as the one we register.
    if (iter->display_name.empty()) {
      std::string name;
      files.AddPath(iter->path, &name);
      iter->display_name = base::FilePath::FromUTF8Unsafe(name);
    } else {
      files.AddPathWithName(iter->path, iter->display_name.AsUTF8Unsafe());
    }

    policy->GrantRequestSpecificFileURL(renderer_id,
                                        net::FilePathToFileURL(iter->path));

    // If the renderer already has permission to read these paths, we don't need
    // to re-grant them. This prevents problems with DnD for files in the CrOS
    // file manager--the file manager already had read/write access to those
    // directories, but dragging a file would cause the read/write access to be
    // overwritten with read-only access, making them impossible to delete or
    // rename until the renderer was killed.
    if (!policy->CanReadFile(renderer_id, iter->path))
      policy->GrantReadFile(renderer_id, iter->path);
  }

  fileapi::IsolatedContext* isolated_context =
      fileapi::IsolatedContext::GetInstance();
  DCHECK(isolated_context);
  std::string filesystem_id = isolated_context->RegisterDraggedFileSystem(
      files);
  if (!filesystem_id.empty()) {
    // Grant the permission iff the ID is valid.
    policy->GrantReadFileSystem(renderer_id, filesystem_id);
  }
  filtered_data.filesystem_id = base::UTF8ToUTF16(filesystem_id);

  Send(new DragMsg_TargetDragEnter(GetRoutingID(), filtered_data, client_pt,
                                   screen_pt, operations_allowed,
                                   key_modifiers));
}

void RenderViewHostImpl::DragTargetDragOver(
    const gfx::Point& client_pt,
    const gfx::Point& screen_pt,
    WebDragOperationsMask operations_allowed,
    int key_modifiers) {
  Send(new DragMsg_TargetDragOver(GetRoutingID(), client_pt, screen_pt,
                                  operations_allowed, key_modifiers));
}

void RenderViewHostImpl::DragTargetDragLeave() {
  Send(new DragMsg_TargetDragLeave(GetRoutingID()));
}

void RenderViewHostImpl::DragTargetDrop(
    const gfx::Point& client_pt,
    const gfx::Point& screen_pt,
    int key_modifiers) {
  Send(new DragMsg_TargetDrop(GetRoutingID(), client_pt, screen_pt,
                              key_modifiers));
}

void RenderViewHostImpl::DesktopNotificationPermissionRequestDone(
    int callback_context) {
  Send(new DesktopNotificationMsg_PermissionRequestDone(
      GetRoutingID(), callback_context));
}

void RenderViewHostImpl::DesktopNotificationPostDisplay(int callback_context) {
  Send(new DesktopNotificationMsg_PostDisplay(GetRoutingID(),
                                              callback_context));
}

void RenderViewHostImpl::DesktopNotificationPostError(
    int notification_id,
    const base::string16& message) {
  Send(new DesktopNotificationMsg_PostError(
      GetRoutingID(), notification_id, message));
}

void RenderViewHostImpl::DesktopNotificationPostClose(int notification_id,
                                                      bool by_user) {
  Send(new DesktopNotificationMsg_PostClose(
      GetRoutingID(), notification_id, by_user));
}

void RenderViewHostImpl::DesktopNotificationPostClick(int notification_id) {
  Send(new DesktopNotificationMsg_PostClick(GetRoutingID(), notification_id));
}

void RenderViewHostImpl::JavaScriptDialogClosed(
    IPC::Message* reply_msg,
    bool success,
    const base::string16& user_input) {
  GetProcess()->SetIgnoreInputEvents(false);
  bool is_waiting = is_waiting_for_beforeunload_ack_ || IsWaitingForUnloadACK();

  // If we are executing as part of (before)unload event handling, we don't
  // want to use the regular hung_renderer_delay_ms_ if the user has agreed to
  // leave the current page. In this case, use the regular timeout value used
  // during the (before)unload handling.
  if (is_waiting) {
    StartHangMonitorTimeout(TimeDelta::FromMilliseconds(
        success ? kUnloadTimeoutMS : hung_renderer_delay_ms_));
  }

  ViewHostMsg_RunJavaScriptMessage::WriteReplyParams(reply_msg,
                                                     success, user_input);
  Send(reply_msg);

  // If we are waiting for an unload or beforeunload ack and the user has
  // suppressed messages, kill the tab immediately; a page that's spamming
  // alerts in onbeforeunload is presumably malicious, so there's no point in
  // continuing to run its script and dragging out the process.
  // This must be done after sending the reply since RenderView can't close
  // correctly while waiting for a response.
  if (is_waiting && are_javascript_messages_suppressed_)
    delegate_->RendererUnresponsive(
        this, is_waiting_for_beforeunload_ack_, IsWaitingForUnloadACK());
}

void RenderViewHostImpl::DragSourceEndedAt(
    int client_x, int client_y, int screen_x, int screen_y,
    WebDragOperation operation) {
  Send(new DragMsg_SourceEnded(GetRoutingID(),
                               gfx::Point(client_x, client_y),
                               gfx::Point(screen_x, screen_y),
                               operation));
}

void RenderViewHostImpl::DragSourceSystemDragEnded() {
  Send(new DragMsg_SourceSystemDragEnded(GetRoutingID()));
}

RenderFrameHost* RenderViewHostImpl::GetMainFrame() {
  return RenderFrameHost::FromID(GetProcess()->GetID(), main_frame_routing_id_);
}

void RenderViewHostImpl::AllowBindings(int bindings_flags) {
  // Never grant any bindings to browser plugin guests.
  if (GetProcess()->IsGuest()) {
    NOTREACHED() << "Never grant bindings to a guest process.";
    return;
  }

  // Ensure we aren't granting WebUI bindings to a process that has already
  // been used for non-privileged views.
  if (bindings_flags & BINDINGS_POLICY_WEB_UI &&
      GetProcess()->HasConnection() &&
      !ChildProcessSecurityPolicyImpl::GetInstance()->HasWebUIBindings(
          GetProcess()->GetID())) {
    // This process has no bindings yet. Make sure it does not have more
    // than this single active view.
    RenderProcessHostImpl* process =
        static_cast<RenderProcessHostImpl*>(GetProcess());
    if (process->GetActiveViewCount() > 1)
      return;
  }

  if (bindings_flags & BINDINGS_POLICY_WEB_UI) {
    ChildProcessSecurityPolicyImpl::GetInstance()->GrantWebUIBindings(
        GetProcess()->GetID());
  }

  enabled_bindings_ |= bindings_flags;
  if (renderer_initialized_)
    Send(new ViewMsg_AllowBindings(GetRoutingID(), enabled_bindings_));
}

int RenderViewHostImpl::GetEnabledBindings() const {
  return enabled_bindings_;
}

void RenderViewHostImpl::SetWebUIProperty(const std::string& name,
                                          const std::string& value) {
  // This is a sanity check before telling the renderer to enable the property.
  // It could lie and send the corresponding IPC messages anyway, but we will
  // not act on them if enabled_bindings_ doesn't agree. If we get here without
  // WebUI bindings, kill the renderer process.
  if (enabled_bindings_ & BINDINGS_POLICY_WEB_UI) {
    Send(new ViewMsg_SetWebUIProperty(GetRoutingID(), name, value));
  } else {
    RecordAction(
        base::UserMetricsAction("BindingsMismatchTerminate_RVH_WebUI"));
    base::KillProcess(
        GetProcess()->GetHandle(), content::RESULT_CODE_KILLED, false);
  }
}

void RenderViewHostImpl::GotFocus() {
  RenderWidgetHostImpl::GotFocus();  // Notifies the renderer it got focus.

  RenderViewHostDelegateView* view = delegate_->GetDelegateView();
  if (view)
    view->GotFocus();
}

void RenderViewHostImpl::LostCapture() {
  RenderWidgetHostImpl::LostCapture();
  delegate_->LostCapture();
}

void RenderViewHostImpl::LostMouseLock() {
  RenderWidgetHostImpl::LostMouseLock();
  delegate_->LostMouseLock();
}

void RenderViewHostImpl::SetInitialFocus(bool reverse) {
  Send(new ViewMsg_SetInitialFocus(GetRoutingID(), reverse));
}

void RenderViewHostImpl::FilesSelectedInChooser(
    const std::vector<ui::SelectedFileInfo>& files,
    FileChooserParams::Mode permissions) {
  // Grant the security access requested to the given files.
  for (size_t i = 0; i < files.size(); ++i) {
    const ui::SelectedFileInfo& file = files[i];
    if (permissions == FileChooserParams::Save) {
      ChildProcessSecurityPolicyImpl::GetInstance()->GrantCreateReadWriteFile(
          GetProcess()->GetID(), file.local_path);
    } else {
      ChildProcessSecurityPolicyImpl::GetInstance()->GrantReadFile(
          GetProcess()->GetID(), file.local_path);
    }
  }
  Send(new ViewMsg_RunFileChooserResponse(GetRoutingID(), files));
}

void RenderViewHostImpl::DirectoryEnumerationFinished(
    int request_id,
    const std::vector<base::FilePath>& files) {
  // Grant the security access requested to the given files.
  for (std::vector<base::FilePath>::const_iterator file = files.begin();
       file != files.end(); ++file) {
    ChildProcessSecurityPolicyImpl::GetInstance()->GrantReadFile(
        GetProcess()->GetID(), *file);
  }
  Send(new ViewMsg_EnumerateDirectoryResponse(GetRoutingID(),
                                              request_id,
                                              files));
}

void RenderViewHostImpl::LoadStateChanged(
    const GURL& url,
    const net::LoadStateWithParam& load_state,
    uint64 upload_position,
    uint64 upload_size) {
  delegate_->LoadStateChanged(url, load_state, upload_position, upload_size);
}

bool RenderViewHostImpl::SuddenTerminationAllowed() const {
  return sudden_termination_allowed_ ||
      GetProcess()->SuddenTerminationAllowed();
}

///////////////////////////////////////////////////////////////////////////////
// RenderViewHostImpl, IPC message handlers:

bool RenderViewHostImpl::OnMessageReceived(const IPC::Message& msg) {
  if (!BrowserMessageFilter::CheckCanDispatchOnUI(msg, this))
    return true;

  // Filter out most IPC messages if this renderer is swapped out.
  // We still want to handle certain ACKs to keep our state consistent.
  if (IsSwappedOut()) {
    if (!SwappedOutMessages::CanHandleWhileSwappedOut(msg)) {
      // If this is a synchronous message and we decided not to handle it,
      // we must send an error reply, or else the renderer will be stuck
      // and won't respond to future requests.
      if (msg.is_sync()) {
        IPC::Message* reply = IPC::SyncMessage::GenerateReply(&msg);
        reply->set_reply_error();
        Send(reply);
      }
      // Don't continue looking for someone to handle it.
      return true;
    }
  }

  if (delegate_->OnMessageReceived(this, msg))
    return true;

  bool handled = true;
  bool msg_is_ok = true;
  IPC_BEGIN_MESSAGE_MAP_EX(RenderViewHostImpl, msg, msg_is_ok)
    IPC_MESSAGE_HANDLER(ViewHostMsg_ShowView, OnShowView)
    IPC_MESSAGE_HANDLER(ViewHostMsg_ShowWidget, OnShowWidget)
    IPC_MESSAGE_HANDLER(ViewHostMsg_ShowFullscreenWidget,
                        OnShowFullscreenWidget)
    IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_RunModal, OnRunModal)
    IPC_MESSAGE_HANDLER(ViewHostMsg_RenderViewReady, OnRenderViewReady)
    IPC_MESSAGE_HANDLER(ViewHostMsg_RenderProcessGone, OnRenderProcessGone)
    IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateState, OnUpdateState)
    IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateTitle, OnUpdateTitle)
    IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateEncoding, OnUpdateEncoding)
    IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateTargetURL, OnUpdateTargetURL)
    IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateInspectorSetting,
                        OnUpdateInspectorSetting)
    IPC_MESSAGE_HANDLER(ViewHostMsg_Close, OnClose)
    IPC_MESSAGE_HANDLER(ViewHostMsg_RequestMove, OnRequestMove)
    IPC_MESSAGE_HANDLER(ViewHostMsg_DidChangeLoadProgress,
                        OnDidChangeLoadProgress)
    IPC_MESSAGE_HANDLER(ViewHostMsg_DidDisownOpener, OnDidDisownOpener)
    IPC_MESSAGE_HANDLER(ViewHostMsg_DocumentAvailableInMainFrame,
                        OnDocumentAvailableInMainFrame)
    IPC_MESSAGE_HANDLER(ViewHostMsg_DocumentOnLoadCompletedInMainFrame,
                        OnDocumentOnLoadCompletedInMainFrame)
    IPC_MESSAGE_HANDLER(ViewHostMsg_ToggleFullscreen, OnToggleFullscreen)
    IPC_MESSAGE_HANDLER(ViewHostMsg_DidContentsPreferredSizeChange,
                        OnDidContentsPreferredSizeChange)
    IPC_MESSAGE_HANDLER(ViewHostMsg_DidChangeScrollOffset,
                        OnDidChangeScrollOffset)
    IPC_MESSAGE_HANDLER(ViewHostMsg_DidChangeScrollbarsForMainFrame,
                        OnDidChangeScrollbarsForMainFrame)
    IPC_MESSAGE_HANDLER(ViewHostMsg_DidChangeScrollOffsetPinningForMainFrame,
                        OnDidChangeScrollOffsetPinningForMainFrame)
    IPC_MESSAGE_HANDLER(ViewHostMsg_DidChangeNumWheelEvents,
                        OnDidChangeNumWheelEvents)
    IPC_MESSAGE_HANDLER(ViewHostMsg_RouteCloseEvent,
                        OnRouteCloseEvent)
    IPC_MESSAGE_HANDLER(ViewHostMsg_RouteMessageEvent, OnRouteMessageEvent)
    IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_RunJavaScriptMessage,
                                    OnRunJavaScriptMessage)
    IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_RunBeforeUnloadConfirm,
                                    OnRunBeforeUnloadConfirm)
    IPC_MESSAGE_HANDLER(DragHostMsg_StartDragging, OnStartDragging)
    IPC_MESSAGE_HANDLER(DragHostMsg_UpdateDragCursor, OnUpdateDragCursor)
    IPC_MESSAGE_HANDLER(DragHostMsg_TargetDrop_ACK, OnTargetDropACK)
    IPC_MESSAGE_HANDLER(ViewHostMsg_TakeFocus, OnTakeFocus)
    IPC_MESSAGE_HANDLER(ViewHostMsg_FocusedNodeChanged, OnFocusedNodeChanged)
    IPC_MESSAGE_HANDLER(ViewHostMsg_ClosePage_ACK, OnClosePageACK)
#if defined(OS_ANDROID)
    IPC_MESSAGE_HANDLER(ViewHostMsg_SelectionRootBoundsChanged,
                        OnSelectionRootBoundsChanged)
#endif
    IPC_MESSAGE_HANDLER(ViewHostMsg_DidZoomURL, OnDidZoomURL)
    IPC_MESSAGE_HANDLER(DesktopNotificationHostMsg_RequestPermission,
                        OnRequestDesktopNotificationPermission)
    IPC_MESSAGE_HANDLER(DesktopNotificationHostMsg_Show,
                        OnShowDesktopNotification)
    IPC_MESSAGE_HANDLER(DesktopNotificationHostMsg_Cancel,
                        OnCancelDesktopNotification)
#if defined(OS_MACOSX) || defined(OS_ANDROID)
    IPC_MESSAGE_HANDLER(ViewHostMsg_ShowPopup, OnShowPopup)
    IPC_MESSAGE_HANDLER(ViewHostMsg_HidePopup, OnHidePopup)
#endif
    IPC_MESSAGE_HANDLER(ViewHostMsg_RunFileChooser, OnRunFileChooser)
    IPC_MESSAGE_HANDLER(ViewHostMsg_DidAccessInitialDocument,
                        OnDidAccessInitialDocument)
    IPC_MESSAGE_HANDLER(AccessibilityHostMsg_Events, OnAccessibilityEvents)
    IPC_MESSAGE_HANDLER(AccessibilityHostMsg_LocationChanges,
                        OnAccessibilityLocationChanges)
    IPC_MESSAGE_HANDLER(ViewHostMsg_FocusedNodeTouched, OnFocusedNodeTouched)
    // Have the super handle all other messages.
    IPC_MESSAGE_UNHANDLED(
        handled = RenderWidgetHostImpl::OnMessageReceived(msg))
  IPC_END_MESSAGE_MAP_EX()

  if (!msg_is_ok) {
    // The message had a handler, but its de-serialization failed.
    // Kill the renderer.
    RecordAction(base::UserMetricsAction("BadMessageTerminate_RVH"));
    GetProcess()->ReceivedBadMessage();
  }

  return handled;
}

void RenderViewHostImpl::Init() {
  RenderWidgetHostImpl::Init();
}

void RenderViewHostImpl::Shutdown() {
  // If we are being run modally (see RunModal), then we need to cleanup.
  if (run_modal_reply_msg_) {
    Send(run_modal_reply_msg_);
    run_modal_reply_msg_ = NULL;
    RenderViewHostImpl* opener =
        RenderViewHostImpl::FromID(GetProcess()->GetID(), run_modal_opener_id_);
    if (opener) {
      opener->StartHangMonitorTimeout(TimeDelta::FromMilliseconds(
          hung_renderer_delay_ms_));
      // Balance out the decrement when we got created.
      opener->increment_in_flight_event_count();
    }
    run_modal_opener_id_ = MSG_ROUTING_NONE;
  }

  RenderWidgetHostImpl::Shutdown();
}

bool RenderViewHostImpl::IsRenderView() const {
  return true;
}

void RenderViewHostImpl::CreateNewWindow(
    int route_id,
    int main_frame_route_id,
    const ViewHostMsg_CreateWindow_Params& params,
    SessionStorageNamespace* session_storage_namespace) {
  ViewHostMsg_CreateWindow_Params validated_params(params);
  GetProcess()->FilterURL(false, &validated_params.target_url);
  GetProcess()->FilterURL(false, &validated_params.opener_url);
  GetProcess()->FilterURL(true, &validated_params.opener_security_origin);

  delegate_->CreateNewWindow(
      GetProcess()->GetID(), route_id, main_frame_route_id, validated_params,
      session_storage_namespace);
}

void RenderViewHostImpl::CreateNewWidget(int route_id,
                                     blink::WebPopupType popup_type) {
  delegate_->CreateNewWidget(GetProcess()->GetID(), route_id, popup_type);
}

void RenderViewHostImpl::CreateNewFullscreenWidget(int route_id) {
  delegate_->CreateNewFullscreenWidget(GetProcess()->GetID(), route_id);
}

void RenderViewHostImpl::OnShowView(int route_id,
                                    WindowOpenDisposition disposition,
                                    const gfx::Rect& initial_pos,
                                    bool user_gesture) {
  if (IsRVHStateActive(rvh_state_)) {
    delegate_->ShowCreatedWindow(
        route_id, disposition, initial_pos, user_gesture);
  }
  Send(new ViewMsg_Move_ACK(route_id));
}

void RenderViewHostImpl::OnShowWidget(int route_id,
                                      const gfx::Rect& initial_pos) {
  if (IsRVHStateActive(rvh_state_))
    delegate_->ShowCreatedWidget(route_id, initial_pos);
  Send(new ViewMsg_Move_ACK(route_id));
}

void RenderViewHostImpl::OnShowFullscreenWidget(int route_id) {
  if (IsRVHStateActive(rvh_state_))
    delegate_->ShowCreatedFullscreenWidget(route_id);
  Send(new ViewMsg_Move_ACK(route_id));
}

void RenderViewHostImpl::OnRunModal(int opener_id, IPC::Message* reply_msg) {
  DCHECK(!run_modal_reply_msg_);
  run_modal_reply_msg_ = reply_msg;
  run_modal_opener_id_ = opener_id;

  RecordAction(base::UserMetricsAction("ShowModalDialog"));

  RenderViewHostImpl* opener =
      RenderViewHostImpl::FromID(GetProcess()->GetID(), run_modal_opener_id_);
  if (opener) {
    opener->StopHangMonitorTimeout();
    // The ack for the mouse down won't come until the dialog closes, so fake it
    // so that we don't get a timeout.
    opener->decrement_in_flight_event_count();
  }

  // TODO(darin): Bug 1107929: Need to inform our delegate to show this view in
  // an app-modal fashion.
}

void RenderViewHostImpl::OnRenderViewReady() {
  render_view_termination_status_ = base::TERMINATION_STATUS_STILL_RUNNING;
  SendScreenRects();
  WasResized();
  delegate_->RenderViewReady(this);
}

void RenderViewHostImpl::OnRenderProcessGone(int status, int exit_code) {
  // Keep the termination status so we can get at it later when we
  // need to know why it died.
  render_view_termination_status_ =
      static_cast<base::TerminationStatus>(status);

  // Reset frame tree state associated with this process.
  delegate_->GetFrameTree()->RenderProcessGone(this);

  // Our base class RenderWidgetHost needs to reset some stuff.
  RendererExited(render_view_termination_status_, exit_code);

  delegate_->RenderViewTerminated(this,
                                  static_cast<base::TerminationStatus>(status),
                                  exit_code);
}

void RenderViewHostImpl::OnUpdateState(int32 page_id, const PageState& state) {
  // Without this check, the renderer can trick the browser into using
  // filenames it can't access in a future session restore.
  if (!CanAccessFilesOfPageState(state)) {
    GetProcess()->ReceivedBadMessage();
    return;
  }

  delegate_->UpdateState(this, page_id, state);
}

void RenderViewHostImpl::OnUpdateTitle(
    int32 page_id,
    const base::string16& title,
    blink::WebTextDirection title_direction) {
  if (title.length() > kMaxTitleChars) {
    NOTREACHED() << "Renderer sent too many characters in title.";
    return;
  }

  delegate_->UpdateTitle(this, page_id, title,
                         WebTextDirectionToChromeTextDirection(
                             title_direction));
}

void RenderViewHostImpl::OnUpdateEncoding(const std::string& encoding_name) {
  delegate_->UpdateEncoding(this, encoding_name);
}

void RenderViewHostImpl::OnUpdateTargetURL(int32 page_id, const GURL& url) {
  if (IsRVHStateActive(rvh_state_))
    delegate_->UpdateTargetURL(page_id, url);

  // Send a notification back to the renderer that we are ready to
  // receive more target urls.
  Send(new ViewMsg_UpdateTargetURL_ACK(GetRoutingID()));
}

void RenderViewHostImpl::OnUpdateInspectorSetting(
    const std::string& key, const std::string& value) {
  GetContentClient()->browser()->UpdateInspectorSetting(
      this, key, value);
}

void RenderViewHostImpl::OnClose() {
  // If the renderer is telling us to close, it has already run the unload
  // events, and we can take the fast path.
  ClosePageIgnoringUnloadEvents();
}

void RenderViewHostImpl::OnRequestMove(const gfx::Rect& pos) {
  if (IsRVHStateActive(rvh_state_))
    delegate_->RequestMove(pos);
  Send(new ViewMsg_Move_ACK(GetRoutingID()));
}

void RenderViewHostImpl::OnDidChangeLoadProgress(double load_progress) {
  delegate_->DidChangeLoadProgress(load_progress);
}

void RenderViewHostImpl::OnDidDisownOpener() {
  delegate_->DidDisownOpener(this);
}

void RenderViewHostImpl::OnDocumentAvailableInMainFrame() {
  delegate_->DocumentAvailableInMainFrame(this);
}

void RenderViewHostImpl::OnDocumentOnLoadCompletedInMainFrame(
    int32 page_id) {
  delegate_->DocumentOnLoadCompletedInMainFrame(this, page_id);
}

void RenderViewHostImpl::OnToggleFullscreen(bool enter_fullscreen) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  delegate_->ToggleFullscreenMode(enter_fullscreen);
  // We need to notify the contents that its fullscreen state has changed. This
  // is done as part of the resize message.
  WasResized();
}

void RenderViewHostImpl::OnDidContentsPreferredSizeChange(
    const gfx::Size& new_size) {
  delegate_->UpdatePreferredSize(new_size);
}

void RenderViewHostImpl::OnRenderAutoResized(const gfx::Size& new_size) {
  delegate_->ResizeDueToAutoResize(new_size);
}

void RenderViewHostImpl::OnDidChangeScrollOffset() {
  if (view_)
    view_->ScrollOffsetChanged();
}

void RenderViewHostImpl::OnDidChangeScrollbarsForMainFrame(
    bool has_horizontal_scrollbar, bool has_vertical_scrollbar) {
  if (view_)
    view_->SetHasHorizontalScrollbar(has_horizontal_scrollbar);
}

void RenderViewHostImpl::OnDidChangeScrollOffsetPinningForMainFrame(
    bool is_pinned_to_left, bool is_pinned_to_right) {
  if (view_)
    view_->SetScrollOffsetPinning(is_pinned_to_left, is_pinned_to_right);
}

void RenderViewHostImpl::OnDidChangeNumWheelEvents(int count) {
}

#if defined(OS_ANDROID)
void RenderViewHostImpl::OnSelectionRootBoundsChanged(
    const gfx::Rect& bounds) {
  if (view_) {
    view_->SelectionRootBoundsChanged(bounds);
  }
}
#endif

void RenderViewHostImpl::OnRouteCloseEvent() {
  // Have the delegate route this to the active RenderViewHost.
  delegate_->RouteCloseEvent(this);
}

void RenderViewHostImpl::OnRouteMessageEvent(
    const ViewMsg_PostMessage_Params& params) {
  // Give to the delegate to route to the active RenderViewHost.
  delegate_->RouteMessageEvent(this, params);
}

void RenderViewHostImpl::OnRunJavaScriptMessage(
    const base::string16& message,
    const base::string16& default_prompt,
    const GURL& frame_url,
    JavaScriptMessageType type,
    IPC::Message* reply_msg) {
  // While a JS message dialog is showing, tabs in the same process shouldn't
  // process input events.
  GetProcess()->SetIgnoreInputEvents(true);
  StopHangMonitorTimeout();
  delegate_->RunJavaScriptMessage(this, message, default_prompt, frame_url,
                                  type, reply_msg,
                                  &are_javascript_messages_suppressed_);
}

void RenderViewHostImpl::OnRunBeforeUnloadConfirm(const GURL& frame_url,
                                                  const base::string16& message,
                                                  bool is_reload,
                                                  IPC::Message* reply_msg) {
  // While a JS before unload dialog is showing, tabs in the same process
  // shouldn't process input events.
  GetProcess()->SetIgnoreInputEvents(true);
  StopHangMonitorTimeout();
  delegate_->RunBeforeUnloadConfirm(this, message, is_reload, reply_msg);
}

void RenderViewHostImpl::OnStartDragging(
    const DropData& drop_data,
    WebDragOperationsMask drag_operations_mask,
    const SkBitmap& bitmap,
    const gfx::Vector2d& bitmap_offset_in_dip,
    const DragEventSourceInfo& event_info) {
  RenderViewHostDelegateView* view = delegate_->GetDelegateView();
  if (!view)
    return;

  DropData filtered_data(drop_data);
  RenderProcessHost* process = GetProcess();
  ChildProcessSecurityPolicyImpl* policy =
      ChildProcessSecurityPolicyImpl::GetInstance();

  // Allow drag of Javascript URLs to enable bookmarklet drag to bookmark bar.
  if (!filtered_data.url.SchemeIs(kJavaScriptScheme))
    process->FilterURL(true, &filtered_data.url);
  process->FilterURL(false, &filtered_data.html_base_url);
  // Filter out any paths that the renderer didn't have access to. This prevents
  // the following attack on a malicious renderer:
  // 1. StartDragging IPC sent with renderer-specified filesystem paths that it
  //    doesn't have read permissions for.
  // 2. We initiate a native DnD operation.
  // 3. DnD operation immediately ends since mouse is not held down. DnD events
  //    still fire though, which causes read permissions to be granted to the
  //    renderer for any file paths in the drop.
  filtered_data.filenames.clear();
  for (std::vector<ui::FileInfo>::const_iterator it =
           drop_data.filenames.begin();
       it != drop_data.filenames.end();
       ++it) {
    if (policy->CanReadFile(GetProcess()->GetID(), it->path))
      filtered_data.filenames.push_back(*it);
  }
  float scale = ui::GetImageScale(GetScaleFactorForView(GetView()));
  gfx::ImageSkia image(gfx::ImageSkiaRep(bitmap, scale));
  view->StartDragging(filtered_data, drag_operations_mask, image,
      bitmap_offset_in_dip, event_info);
}

void RenderViewHostImpl::OnUpdateDragCursor(WebDragOperation current_op) {
  RenderViewHostDelegateView* view = delegate_->GetDelegateView();
  if (view)
    view->UpdateDragCursor(current_op);
}

void RenderViewHostImpl::OnTargetDropACK() {
  NotificationService::current()->Notify(
      NOTIFICATION_RENDER_VIEW_HOST_DID_RECEIVE_DRAG_TARGET_DROP_ACK,
      Source<RenderViewHost>(this),
      NotificationService::NoDetails());
}

void RenderViewHostImpl::OnTakeFocus(bool reverse) {
  RenderViewHostDelegateView* view = delegate_->GetDelegateView();
  if (view)
    view->TakeFocus(reverse);
}

void RenderViewHostImpl::OnFocusedNodeChanged(bool is_editable_node) {
  if (view_)
    view_->FocusedNodeChanged(is_editable_node);
#if defined(OS_WIN)
  if (!is_editable_node && virtual_keyboard_requested_) {
    virtual_keyboard_requested_ = false;
    BrowserThread::PostDelayedTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(base::IgnoreResult(&DismissVirtualKeyboardTask)),
        TimeDelta::FromMilliseconds(kVirtualKeyboardDisplayWaitTimeoutMs));
  }
#endif
  NotificationService::current()->Notify(
      NOTIFICATION_FOCUS_CHANGED_IN_PAGE,
      Source<RenderViewHost>(this),
      Details<const bool>(&is_editable_node));
}

void RenderViewHostImpl::OnUserGesture() {
  delegate_->OnUserGesture();
}

void RenderViewHostImpl::OnClosePageACK() {
  decrement_in_flight_event_count();
  ClosePageIgnoringUnloadEvents();
}

void RenderViewHostImpl::NotifyRendererUnresponsive() {
  delegate_->RendererUnresponsive(
      this, is_waiting_for_beforeunload_ack_, IsWaitingForUnloadACK());
}

void RenderViewHostImpl::NotifyRendererResponsive() {
  delegate_->RendererResponsive(this);
}

void RenderViewHostImpl::RequestToLockMouse(bool user_gesture,
                                            bool last_unlocked_by_target) {
  delegate_->RequestToLockMouse(user_gesture, last_unlocked_by_target);
}

bool RenderViewHostImpl::IsFullscreen() const {
  return delegate_->IsFullscreenForCurrentTab();
}

void RenderViewHostImpl::OnFocus() {
  // Note: We allow focus and blur from swapped out RenderViewHosts, even when
  // the active RenderViewHost is in a different BrowsingInstance (e.g., WebUI).
  delegate_->Activate();
}

void RenderViewHostImpl::OnBlur() {
  delegate_->Deactivate();
}

gfx::Rect RenderViewHostImpl::GetRootWindowResizerRect() const {
  return delegate_->GetRootWindowResizerRect();
}

void RenderViewHostImpl::ForwardMouseEvent(
    const blink::WebMouseEvent& mouse_event) {

  // We make a copy of the mouse event because
  // RenderWidgetHost::ForwardMouseEvent will delete |mouse_event|.
  blink::WebMouseEvent event_copy(mouse_event);
  RenderWidgetHostImpl::ForwardMouseEvent(event_copy);

  switch (event_copy.type) {
    case WebInputEvent::MouseMove:
      delegate_->HandleMouseMove();
      break;
    case WebInputEvent::MouseLeave:
      delegate_->HandleMouseLeave();
      break;
    case WebInputEvent::MouseDown:
      delegate_->HandleMouseDown();
      break;
    case WebInputEvent::MouseWheel:
      if (ignore_input_events())
        delegate_->OnIgnoredUIEvent();
      break;
    case WebInputEvent::MouseUp:
      delegate_->HandleMouseUp();
    default:
      // For now, we don't care about the rest.
      break;
  }
}

void RenderViewHostImpl::OnPointerEventActivate() {
  delegate_->HandlePointerActivate();
}

void RenderViewHostImpl::ForwardKeyboardEvent(
    const NativeWebKeyboardEvent& key_event) {
  if (ignore_input_events()) {
    if (key_event.type == WebInputEvent::RawKeyDown)
      delegate_->OnIgnoredUIEvent();
    return;
  }
  RenderWidgetHostImpl::ForwardKeyboardEvent(key_event);
}

#if defined(OS_ANDROID)
void RenderViewHostImpl::DidSelectPopupMenuItems(
    const std::vector<int>& selected_indices) {
  Send(new ViewMsg_SelectPopupMenuItems(GetRoutingID(), false,
                                        selected_indices));
}

void RenderViewHostImpl::DidCancelPopupMenu() {
  Send(new ViewMsg_SelectPopupMenuItems(GetRoutingID(), true,
                                        std::vector<int>()));
}
#endif

#if defined(OS_MACOSX)
void RenderViewHostImpl::DidSelectPopupMenuItem(int selected_index) {
  Send(new ViewMsg_SelectPopupMenuItem(GetRoutingID(), selected_index));
}

void RenderViewHostImpl::DidCancelPopupMenu() {
  Send(new ViewMsg_SelectPopupMenuItem(GetRoutingID(), -1));
}
#endif

void RenderViewHostImpl::SendOrientationChangeEvent(int orientation) {
  Send(new ViewMsg_OrientationChangeEvent(GetRoutingID(), orientation));
}

void RenderViewHostImpl::ToggleSpeechInput() {
  Send(new InputTagSpeechMsg_ToggleSpeechInput(GetRoutingID()));
}

bool RenderViewHostImpl::IsWaitingForUnloadACK() const {
  return rvh_state_ == STATE_WAITING_FOR_UNLOAD_ACK ||
         rvh_state_ == STATE_WAITING_FOR_CLOSE ||
         rvh_state_ == STATE_PENDING_SHUTDOWN ||
         rvh_state_ == STATE_PENDING_SWAP_OUT;
}

void RenderViewHostImpl::ExitFullscreen() {
  RejectMouseLockOrUnlockIfNecessary();
  // Notify delegate_ and renderer of fullscreen state change.
  OnToggleFullscreen(false);
}

WebPreferences RenderViewHostImpl::GetWebkitPreferences() {
  return delegate_->GetWebkitPrefs();
}

void RenderViewHostImpl::DisownOpener() {
  // This should only be called when swapped out.
  DCHECK(IsSwappedOut());

  Send(new ViewMsg_DisownOpener(GetRoutingID()));
}

void RenderViewHostImpl::SetAccessibilityCallbackForTesting(
    const base::Callback<void(ui::AXEvent)>& callback) {
  accessibility_testing_callback_ = callback;
}

void RenderViewHostImpl::UpdateWebkitPreferences(const WebPreferences& prefs) {
  Send(new ViewMsg_UpdateWebPreferences(GetRoutingID(), prefs));
}

void RenderViewHostImpl::GetAudioOutputControllers(
    const GetAudioOutputControllersCallback& callback) const {
  AudioRendererHost* audio_host =
      static_cast<RenderProcessHostImpl*>(GetProcess())->audio_renderer_host();
  audio_host->GetOutputControllers(GetRoutingID(), callback);
}

void RenderViewHostImpl::ClearFocusedElement() {
  Send(new ViewMsg_ClearFocusedElement(GetRoutingID()));
}

void RenderViewHostImpl::Zoom(PageZoom zoom) {
  Send(new ViewMsg_Zoom(GetRoutingID(), zoom));
}

void RenderViewHostImpl::DisableScrollbarsForThreshold(const gfx::Size& size) {
  Send(new ViewMsg_DisableScrollbarsForSmallWindows(GetRoutingID(), size));
}

void RenderViewHostImpl::EnablePreferredSizeMode() {
  Send(new ViewMsg_EnablePreferredSizeChangedMode(GetRoutingID()));
}

void RenderViewHostImpl::EnableAutoResize(const gfx::Size& min_size,
                                          const gfx::Size& max_size) {
  SetShouldAutoResize(true);
  Send(new ViewMsg_EnableAutoResize(GetRoutingID(), min_size, max_size));
}

void RenderViewHostImpl::DisableAutoResize(const gfx::Size& new_size) {
  SetShouldAutoResize(false);
  Send(new ViewMsg_DisableAutoResize(GetRoutingID(), new_size));
}

void RenderViewHostImpl::CopyImageAt(int x, int y) {
  Send(new ViewMsg_CopyImageAt(GetRoutingID(), x, y));
}

void RenderViewHostImpl::ExecuteMediaPlayerActionAtLocation(
  const gfx::Point& location, const blink::WebMediaPlayerAction& action) {
  Send(new ViewMsg_MediaPlayerActionAt(GetRoutingID(), location, action));
}

void RenderViewHostImpl::ExecutePluginActionAtLocation(
  const gfx::Point& location, const blink::WebPluginAction& action) {
  Send(new ViewMsg_PluginActionAt(GetRoutingID(), location, action));
}

void RenderViewHostImpl::NotifyMoveOrResizeStarted() {
  Send(new ViewMsg_MoveOrResizeStarted(GetRoutingID()));
}

void RenderViewHostImpl::OnAccessibilityEvents(
    const std::vector<AccessibilityHostMsg_EventParams>& params) {
  if ((accessibility_mode() != AccessibilityModeOff) && view_ &&
      IsRVHStateActive(rvh_state_)) {
    if (accessibility_mode() & AccessibilityModeFlagPlatform) {
      view_->CreateBrowserAccessibilityManagerIfNeeded();
      BrowserAccessibilityManager* manager =
          view_->GetBrowserAccessibilityManager();
      if (manager)
        manager->OnAccessibilityEvents(params);
    }

    std::vector<AXEventNotificationDetails> details;
    for (unsigned int i = 0; i < params.size(); ++i) {
      const AccessibilityHostMsg_EventParams& param = params[i];
      AXEventNotificationDetails detail(param.update.nodes,
                                        param.event_type,
                                        param.id,
                                        GetProcess()->GetID(),
                                        GetRoutingID());
      details.push_back(detail);
    }

    delegate_->AccessibilityEventReceived(details);
  }

  // Always send an ACK or the renderer can be in a bad state.
  Send(new AccessibilityMsg_Events_ACK(GetRoutingID()));

  // The rest of this code is just for testing; bail out if we're not
  // in that mode.
  if (accessibility_testing_callback_.is_null())
    return;

  for (unsigned i = 0; i < params.size(); i++) {
    const AccessibilityHostMsg_EventParams& param = params[i];
    if (static_cast<int>(param.event_type) < 0)
      continue;
    if (!ax_tree_)
      ax_tree_.reset(new ui::AXTree(param.update));
    else
      CHECK(ax_tree_->Unserialize(param.update)) << ax_tree_->error();
    accessibility_testing_callback_.Run(param.event_type);
  }
}

void RenderViewHostImpl::OnAccessibilityLocationChanges(
    const std::vector<AccessibilityHostMsg_LocationChangeParams>& params) {
  if (view_ && IsRVHStateActive(rvh_state_)) {
    if (accessibility_mode() & AccessibilityModeFlagPlatform) {
      view_->CreateBrowserAccessibilityManagerIfNeeded();
      BrowserAccessibilityManager* manager =
          view_->GetBrowserAccessibilityManager();
      if (manager)
        manager->OnLocationChanges(params);
    }
    // TODO(aboxhall): send location change events to web contents observers too
  }
}

void RenderViewHostImpl::OnDidZoomURL(double zoom_level,
                                      bool remember,
                                      const GURL& url) {
  HostZoomMapImpl* host_zoom_map = static_cast<HostZoomMapImpl*>(
      HostZoomMap::GetForBrowserContext(GetProcess()->GetBrowserContext()));
  if (remember) {
    host_zoom_map->
        SetZoomLevelForHost(net::GetHostOrSpecFromURL(url), zoom_level);
  } else {
    host_zoom_map->SetTemporaryZoomLevel(
        GetProcess()->GetID(), GetRoutingID(), zoom_level);
  }
}

void RenderViewHostImpl::OnRequestDesktopNotificationPermission(
    const GURL& source_origin, int callback_context) {
  GetContentClient()->browser()->RequestDesktopNotificationPermission(
      source_origin, callback_context, GetProcess()->GetID(), GetRoutingID());
}

void RenderViewHostImpl::OnShowDesktopNotification(
    const ShowDesktopNotificationHostMsgParams& params) {
  GetContentClient()->browser()->ShowDesktopNotification(
      params, GetProcess()->GetID(), GetRoutingID(), false);
}

void RenderViewHostImpl::OnCancelDesktopNotification(int notification_id) {
  GetContentClient()->browser()->CancelDesktopNotification(
      GetProcess()->GetID(), GetRoutingID(), notification_id);
}

void RenderViewHostImpl::OnRunFileChooser(const FileChooserParams& params) {
  delegate_->RunFileChooser(this, params);
}

void RenderViewHostImpl::OnDidAccessInitialDocument() {
  has_accessed_initial_document_ = true;
  delegate_->DidAccessInitialDocument();
}

void RenderViewHostImpl::OnFocusedNodeTouched(bool editable) {
#if defined(OS_WIN)
  if (editable) {
    virtual_keyboard_requested_ = base::win::DisplayVirtualKeyboard();
  } else {
    virtual_keyboard_requested_ = false;
    base::win::DismissVirtualKeyboard();
  }
#endif
}

#if defined(OS_MACOSX) || defined(OS_ANDROID)
void RenderViewHostImpl::OnShowPopup(
    const ViewHostMsg_ShowPopup_Params& params) {
  RenderViewHostDelegateView* view = delegate_->GetDelegateView();
  if (view) {
    view->ShowPopupMenu(params.bounds,
                        params.item_height,
                        params.item_font_size,
                        params.selected_item,
                        params.popup_items,
                        params.right_aligned,
                        params.allow_multiple_selection);
  }
}

void RenderViewHostImpl::OnHidePopup() {
  RenderViewHostDelegateView* view = delegate_->GetDelegateView();
  if (view)
    view->HidePopupMenu();
}
#endif

void RenderViewHostImpl::SetState(RenderViewHostImplState rvh_state) {
  // We update the number of RenderViews in a SiteInstance when the
  // swapped out status of this RenderView gets flipped to/from live.
  if (!IsRVHStateActive(rvh_state_) && IsRVHStateActive(rvh_state))
    instance_->increment_active_view_count();
  else if (IsRVHStateActive(rvh_state_) && !IsRVHStateActive(rvh_state))
    instance_->decrement_active_view_count();

  // Whenever we change the RVH state to and from live or swapped out state, we
  // should not be waiting for beforeunload or unload acks.  We clear them here
  // to be safe, since they can cause navigations to be ignored in OnNavigate.
  if (rvh_state == STATE_DEFAULT ||
      rvh_state == STATE_SWAPPED_OUT ||
      rvh_state_ == STATE_DEFAULT ||
      rvh_state_ == STATE_SWAPPED_OUT) {
    is_waiting_for_beforeunload_ack_ = false;
  }
  rvh_state_ = rvh_state;

}

bool RenderViewHostImpl::CanAccessFilesOfPageState(
    const PageState& state) const {
  ChildProcessSecurityPolicyImpl* policy =
      ChildProcessSecurityPolicyImpl::GetInstance();

  const std::vector<base::FilePath>& file_paths = state.GetReferencedFiles();
  for (std::vector<base::FilePath>::const_iterator file = file_paths.begin();
       file != file_paths.end(); ++file) {
    if (!policy->CanReadFile(GetProcess()->GetID(), *file))
      return false;
  }
  return true;
}

void RenderViewHostImpl::AttachToFrameTree() {
  FrameTree* frame_tree = delegate_->GetFrameTree();

  frame_tree->ResetForMainFrameSwap();
}

}  // namespace content
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root/content/browser/renderer_host/render_view_host_impl.cc

DEFINITIONS
