cc: Rename VSync to BeginFrame

cc/trees/single_thread_proxy.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/single_thread_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/debug/trace_event.h"
 #include "cc/base/thread.h"
 #include "cc/output/context_provider.h"
@@ skipping 386 matching lines @@
   layer_tree_host_->UpdateLayers(
       queue.get(), layer_tree_host_impl_->memory_allocation_limit_bytes());
 
   layer_tree_host_->WillCommit();
   DoCommit(queue.Pass());
   bool result = DoComposite(offscreen_context_provider,
                             frame_begin_time,
                             device_viewport_damage_rect,
                             for_readback,
                             frame);
-  layer_tree_host_->DidBeginFrame();
+  layer_tree_host_->DidBeginMainFrame();
   return result;
 }
 
 bool SingleThreadProxy::ShouldComposite() const {
   DCHECK(Proxy::IsImplThread());
   return layer_tree_host_impl_->visible() &&
          layer_tree_host_impl_->CanDraw();
 }
 
 bool SingleThreadProxy::DoComposite(
@@ skipping 60 matching lines @@
 
 bool SingleThreadProxy::CommitPendingForTesting() { return false; }
 
 skia::RefPtr<SkPicture> SingleThreadProxy::CapturePicture() {
   // Impl-side painting only.
   NOTREACHED();
   return skia::RefPtr<SkPicture>();
 }
 
 }  // namespace cc