cc: Rename VSync to BeginFrame

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 98bafc37599e18271d7c51d5861455e7ab1deeb3..1c384faeb580da69855fecb99b5885888cf6ce00 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -370,9 +370,9 @@ bool LayerTreeHostImpl::HaveTouchEventHandlersAt(gfx::Point viewport_point) {
   return false;
 }
 
-void LayerTreeHostImpl::DidReceiveLastInputEventForVSync(
+void LayerTreeHostImpl::DidReceiveLastInputEventForBeginImplFrame(
     base::TimeTicks frame_time) {
-  client_->DidReceiveLastInputEventForVSync(frame_time);
+  client_->DidReceiveLastInputEventForBeginImplFrame(frame_time);
 }
 
 void LayerTreeHostImpl::TrackDamageForAllSurfaces(
@@ -1015,8 +1015,8 @@ void LayerTreeHostImpl::OnVSyncParametersChanged(base::TimeTicks timebase,
   client_->OnVSyncParametersChanged(timebase, interval);
 }
 
-void LayerTreeHostImpl::DidVSync(base::TimeTicks frame_time) {
-  client_->DidVSync(frame_time);
+void LayerTreeHostImpl::BeginImplFrame(base::TimeTicks frame_time) {
+  client_->DidBeginImplFrame(frame_time);
 }
 
 void LayerTreeHostImpl::OnSendFrameToParentCompositorAck(
@@ -1166,9 +1166,9 @@ bool LayerTreeHostImpl::SwapBuffers(const LayerTreeHostImpl::FrameData& frame) {
   return true;
 }
 
-void LayerTreeHostImpl::EnableVSyncNotification(bool enable) {
+void LayerTreeHostImpl::SetNeedsBeginImplFrame(bool enable) {
   if (output_surface_)
-    output_surface_->EnableVSyncNotification(enable);
+    output_surface_->SetNeedsBeginImplFrame(enable);
 }
 
 gfx::Size LayerTreeHostImpl::DeviceViewportSize() const {