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 c9db433d91aa99a413aaefddfdaa2b49e105c580..9a98e80262acc1f15e19462072c8ac97facaa099 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -368,9 +368,9 @@ bool LayerTreeHostImpl::HaveTouchEventHandlersAt(gfx::Point viewport_point) {
   return false;
 }
 
-void LayerTreeHostImpl::DidReceiveLastInputEventForVSync(
+void LayerTreeHostImpl::DidReceiveLastInputEventForBeginFrame(
     base::TimeTicks frame_time) {
-  client_->DidReceiveLastInputEventForVSync(frame_time);
+  client_->DidReceiveLastInputEventForBeginFrame(frame_time);
 }
 
 void LayerTreeHostImpl::TrackDamageForAllSurfaces(
@@ -1013,8 +1013,8 @@ void LayerTreeHostImpl::OnVSyncParametersChanged(base::TimeTicks timebase,
   client_->OnVSyncParametersChanged(timebase, interval);
 }
 
-void LayerTreeHostImpl::DidVSync(base::TimeTicks frame_time) {
-  client_->DidVSync(frame_time);
+void LayerTreeHostImpl::BeginFrame(base::TimeTicks frame_time) {
+  client_->DidBeginFrame(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::EnableBeginFrameNotification(bool enable) {
   if (output_surface_)
-    output_surface_->EnableVSyncNotification(enable);
+    output_surface_->EnableBeginFrameNotification(enable);
 }
 
 gfx::Size LayerTreeHostImpl::DeviceViewportSize() const {