cc: Rename VSync to BeginFrame

cc/trees/layer_tree_host.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include <algorithm>
 #include <stack>
 
 #include "base/bind.h"
@@ skipping 207 matching lines @@
   DCHECK(proxy_->IsImplThread());
   if (contents_texture_manager_)
     contents_texture_manager_->ClearAllMemory(resource_provider);
 }
 
 void LayerTreeHost::AcquireLayerTextures() {
   DCHECK(proxy_->IsMainThread());
   proxy_->AcquireLayerTextures();
 }
 
-void LayerTreeHost::DidBeginFrame() {
-  client_->DidBeginFrame();
+void LayerTreeHost::DidBeginMainFrame() {
+  client_->DidBeginMainFrame();
 }
 
 void LayerTreeHost::UpdateClientAnimations(base::TimeTicks frame_begin_time) {
   animating_ = true;
   client_->Animate((frame_begin_time - base::TimeTicks()).InSecondsF());
   animating_ = false;
 }
 
 void LayerTreeHost::DidStopFlinging() {
   proxy_->MainThreadHasStoppedFlinging();
@@ skipping 855 matching lines @@
     bool start_ready_animations = true;
     (*iter).second->UpdateState(start_ready_animations, NULL);
   }
 }
 
 skia::RefPtr<SkPicture> LayerTreeHost::CapturePicture() {
   return proxy_->CapturePicture();
 }
 
 }  // namespace cc