Send vsync notification from browser to renderer

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index e81bc5d33226ef64f8a05145bf8840b26825aec6..0fe6431160fd2db024498605da196f4bbbfb5a1d 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -398,6 +398,10 @@ class CONTENT_EXPORT RenderWidgetHostImpl : virtual public RenderWidgetHost,
   virtual void UpdateVSyncParameters(base::TimeTicks timebase,
                                      base::TimeDelta interval);
 
+  // Notifies the RenderWidget that the display vsync signal was triggered and
+  // now is a good time to render a new frame.
+  virtual void SendVSync(base::TimeTicks frame_time);
+
   // Called by the view in response to AcceleratedSurfaceBuffersSwapped or
   // AcceleratedSurfacePostSubBuffer.
   static void AcknowledgeBufferPresent(
@@ -577,6 +581,7 @@ class CONTENT_EXPORT RenderWidgetHostImpl : virtual public RenderWidgetHost,
                                          const gfx::Size& size,
                                          int32 gpu_process_host_id);
   bool OnSwapCompositorFrame(const IPC::Message& message);
+  void OnEnableVSyncNotification(bool enable);

[mkosiba (inactive), 2013/03/26 13:51:48]

nit: Enable usually means a transition from disabled to enabled but not the
other way around. Maybe ToggleVSyncNotification or
On(Request|Set)VSyncNotificationEnabled?

[Sami, 2013/03/26 17:51:35]

Agreed, OnSetVSyncNotificationEnabled reads much better.

   void OnUpdateRect(const ViewHostMsg_UpdateRect_Params& params);
   void OnUpdateIsDelayed();
   void OnInputEventAck(WebKit::WebInputEvent::Type event_type,