Provide a vsync notification to the renderer

content/renderer/gpu/compositor_output_surface.cc

Index: content/renderer/gpu/compositor_output_surface.cc
diff --git a/content/renderer/gpu/compositor_output_surface.cc b/content/renderer/gpu/compositor_output_surface.cc
index 2b18c357317fa617559009923ae85cdb946e9e05..9856d3d957630d0b055852f1cc94b1aa32f04371 100644
--- a/content/renderer/gpu/compositor_output_surface.cc
+++ b/content/renderer/gpu/compositor_output_surface.cc
@@ -37,7 +37,9 @@ namespace content {
 IPC::ForwardingMessageFilter* CompositorOutputSurface::CreateFilter(
     base::TaskRunner* target_task_runner)
 {
-  uint32 messages_to_filter[] = {ViewMsg_UpdateVSyncParameters::ID};
+  uint32 messages_to_filter[] = {
+    ViewMsg_UpdateVSyncParameters::ID, ViewMsg_DidVSync::ID
+  };
   return new IPC::ForwardingMessageFilter(
       messages_to_filter, arraysize(messages_to_filter),
       target_task_runner);
@@ -116,6 +118,7 @@ void CompositorOutputSurface::OnMessageReceived(const IPC::Message& message) {
     return;
   IPC_BEGIN_MESSAGE_MAP(CompositorOutputSurface, message)
     IPC_MESSAGE_HANDLER(ViewMsg_UpdateVSyncParameters, OnUpdateVSyncParameters);
+    IPC_MESSAGE_HANDLER(ViewMsg_DidVSync, DidVSync);
   IPC_END_MESSAGE_MAP()
 }
 
@@ -126,6 +129,18 @@ void CompositorOutputSurface::OnUpdateVSyncParameters(
   client_->OnVSyncParametersChanged(timebase, interval);
 }
 
+void CompositorOutputSurface::EnableVSyncNotification(bool enable) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(client_);
+  Send(new ViewHostMsg_EnableVSyncNotification(routing_id_, enable));
+}
+
+void CompositorOutputSurface::DidVSync(base::TimeTicks frame_time) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(client_);
+  client_->DidVSync(frame_time);
+}
+
 bool CompositorOutputSurface::Send(IPC::Message* message) {
   return ChildThread::current()->sync_message_filter()->Send(message);
 }