Refactoring the way begin frame sources inside scheduler work.

cc/trees/thread_proxy.h

Index: cc/trees/thread_proxy.h
diff --git a/cc/trees/thread_proxy.h b/cc/trees/thread_proxy.h
index 134d5c518f2cfb100cf99faaf4f538ef43b2e285..496a3426cc8f08a29a95762436133b3391fe893f 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -175,10 +175,7 @@ class CC_EXPORT ThreadProxy : public Proxy,
   // LayerTreeHostImplClient implementation
   virtual void UpdateRendererCapabilitiesOnImplThread() OVERRIDE;
   virtual void DidLoseOutputSurfaceOnImplThread() OVERRIDE;
-  virtual void CommitVSyncParameters(base::TimeTicks timebase,
-                                     base::TimeDelta interval) OVERRIDE;
   virtual void SetEstimatedParentDrawTime(base::TimeDelta draw_time) OVERRIDE;
-  virtual void BeginFrame(const BeginFrameArgs& args) OVERRIDE;
   virtual void SetMaxSwapsPendingOnImplThread(int max) OVERRIDE;
   virtual void DidSwapBuffersOnImplThread() OVERRIDE;
   virtual void DidSwapBuffersCompleteOnImplThread() OVERRIDE;
@@ -209,7 +206,6 @@ class CC_EXPORT ThreadProxy : public Proxy,
   virtual void DidManageTiles() OVERRIDE;
 
   // SchedulerClient implementation
-  virtual void SetNeedsBeginFrame(bool enable) OVERRIDE;
   virtual void WillBeginImplFrame(const BeginFrameArgs& args) OVERRIDE;
   virtual void ScheduledActionSendBeginMainFrame() OVERRIDE;
   virtual DrawResult ScheduledActionDrawAndSwapIfPossible() OVERRIDE;
@@ -257,7 +253,6 @@ class CC_EXPORT ThreadProxy : public Proxy,
   void InitializeImplOnImplThread(CompletionEvent* completion);
   void SetLayerTreeHostClientReadyOnImplThread();
   void SetVisibleOnImplThread(CompletionEvent* completion, bool visible);
-  void UpdateBackgroundAnimateTicking();
   void HasInitializedOutputSurfaceOnImplThread(
       CompletionEvent* completion,
       bool* has_initialized_output_surface);