Provide a vsync notification to the renderer

cc/layer_tree_host_impl.cc

Index: cc/layer_tree_host_impl.cc
diff --git a/cc/layer_tree_host_impl.cc b/cc/layer_tree_host_impl.cc
index 23d3a2ef24cb3c4947132397e2fbeaf6ecb5534e..053788e5160a35c3f7be5926f5639509ac9a19b3 100644
--- a/cc/layer_tree_host_impl.cc
+++ b/cc/layer_tree_host_impl.cc
@@ -238,6 +238,11 @@ OutputSurface* LayerTreeHostImpl::outputSurface() const
     return m_outputSurface.get();
 }
 
+void LayerTreeHostImpl::enableVSyncNotification(bool enable)
+{
+    m_outputSurface->EnableVSyncNotification(enable);
+}
+
 void LayerTreeHostImpl::animate(base::TimeTicks monotonicTime, base::Time wallClockTime)
 {
     animatePageScale(monotonicTime);
@@ -753,6 +758,11 @@ void LayerTreeHostImpl::OnSendFrameToParentCompositorAck(const CompositorFrameAc
     m_renderer->receiveCompositorFrameAck(ack);
 }
 
+void LayerTreeHostImpl::DidVSync(base::TimeTicks frameTime)
+{
+    m_client->didVSync(frameTime);
+}
+
 void LayerTreeHostImpl::OnCanDrawStateChangedForTree(LayerTreeImpl*)
 {
     m_client->onCanDrawStateChanged(canDraw());