Send vsync notification from browser to renderer

content/port/browser/render_widget_host_view_port.h

Index: content/port/browser/render_widget_host_view_port.h
diff --git a/content/port/browser/render_widget_host_view_port.h b/content/port/browser/render_widget_host_view_port.h
index 051a64f27b87a04acaa7cf60e72afe08c59b5f3f..65802b17b1074d7d7afb45f39b708d684247ccdc 100644
--- a/content/port/browser/render_widget_host_view_port.h
+++ b/content/port/browser/render_widget_host_view_port.h
@@ -225,6 +225,10 @@ class CONTENT_EXPORT RenderWidgetHostViewPort : public RenderWidgetHostView,
       const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params_in_pixel,
       int gpu_host_id) = 0;
 
+  // Request a periodic vsync signal notification from the View. The signal will
+  // be delivered until explicitly disabled.
+  virtual void SetVSyncNotificationEnabled(bool enabled) = 0;
+
   // Release the accelerated surface temporarily. It will be recreated on the
   // next swap buffers or post sub buffer.
   virtual void AcceleratedSurfaceSuspend() = 0;