cc: Rename VSync to BeginFrame

cc/trees/single_thread_proxy.h

Index: cc/trees/single_thread_proxy.h
diff --git a/cc/trees/single_thread_proxy.h b/cc/trees/single_thread_proxy.h
index 1a11bb0bd2cba5c75017abbdced797c599ed299f..525f6094e3a04e835bf0e89116faa51fa9167e5e 100644
--- a/cc/trees/single_thread_proxy.h
+++ b/cc/trees/single_thread_proxy.h
@@ -50,7 +50,8 @@ class SingleThreadProxy : public Proxy, LayerTreeHostImplClient {
   virtual void OnSwapBuffersCompleteOnImplThread() OVERRIDE {}
   virtual void OnVSyncParametersChanged(base::TimeTicks timebase,
                                         base::TimeDelta interval) OVERRIDE {}
-  virtual void DidVSync(base::TimeTicks frame_time) OVERRIDE {}
+  virtual void BeginFrameOnImplThread(base::TimeTicks frame_time)
+      OVERRIDE {}
   virtual void OnCanDrawStateChanged(bool can_draw) OVERRIDE;
   virtual void OnHasPendingTreeStateChanged(bool have_pending_tree) OVERRIDE;
   virtual void SetNeedsRedrawOnImplThread() OVERRIDE;
@@ -70,8 +71,8 @@ class SingleThreadProxy : public Proxy, LayerTreeHostImplClient {
   virtual void RenewTreePriority() OVERRIDE {}
   virtual void RequestScrollbarAnimationOnImplThread(base::TimeDelta delay)
       OVERRIDE {}
-  virtual void DidReceiveLastInputEventForVSync(base::TimeTicks frame_time)
-      OVERRIDE {}
+  virtual void DidReceiveLastInputEventForBeginFrameOnImplThread(
+      base::TimeTicks frame_time) OVERRIDE {}
   virtual void DidActivatePendingTree() OVERRIDE {}
 
   // Called by the legacy path where RenderWidget does the scheduling.