Send vsync notification from browser to renderer

content/renderer/gpu/compositor_output_surface.h

Index: content/renderer/gpu/compositor_output_surface.h
diff --git a/content/renderer/gpu/compositor_output_surface.h b/content/renderer/gpu/compositor_output_surface.h
index 255c61865d849155a0627ba05e9768fdcf5ac2eb..034037351b3c7559c7429ba9faacca4f76cbf383 100644
--- a/content/renderer/gpu/compositor_output_surface.h
+++ b/content/renderer/gpu/compositor_output_surface.h
@@ -46,6 +46,7 @@ class CompositorOutputSurface
   // cc::OutputSurface implementation.
   virtual bool BindToClient(cc::OutputSurfaceClient* client) OVERRIDE;
   virtual void SendFrameToParentCompositor(cc::CompositorFrame*) OVERRIDE;
+  virtual void EnableVSyncNotification(bool enable) OVERRIDE;
 
   // TODO(epenner): This seems out of place here and would be a better fit
   // int CompositorThread after it is fully refactored (http://crbug/170828)
@@ -78,6 +79,7 @@ class CompositorOutputSurface
   void OnMessageReceived(const IPC::Message& message);
   void OnUpdateVSyncParameters(
       base::TimeTicks timebase, base::TimeDelta interval);
+  void DidVSync(base::TimeTicks frame_time);
   bool Send(IPC::Message* message);
 
   scoped_refptr<IPC::ForwardingMessageFilter> output_surface_filter_;