cc: Emulate BeginFrame in OutputSurfaces that don't support it natively

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 72ca634e0880cf27bb453756c7d0c8a41e77f31c..328dfa6bd0f51b627892df5d7286fecd6650ad73 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -52,8 +52,6 @@ class LayerTreeHostImplClient {
  public:
   virtual void DidLoseOutputSurfaceOnImplThread() = 0;
   virtual void OnSwapBuffersCompleteOnImplThread() = 0;
-  virtual void OnVSyncParametersChanged(base::TimeTicks timebase,
-                                        base::TimeDelta interval) = 0;
   virtual void BeginFrameOnImplThread(base::TimeTicks frame_time) = 0;
   virtual void OnCanDrawStateChanged(bool can_draw) = 0;
   virtual void OnHasPendingTreeStateChanged(bool has_pending_tree) = 0;
@@ -181,8 +179,6 @@ class CC_EXPORT LayerTreeHostImpl
   virtual float DeviceScaleFactor() const OVERRIDE;
   virtual const LayerTreeSettings& Settings() const OVERRIDE;
  public:
-  virtual void DidLoseOutputSurface() OVERRIDE;
-  virtual void OnSwapBuffersComplete() OVERRIDE;
   virtual void SetFullRootLayerDamage() OVERRIDE;
   virtual void SetManagedMemoryPolicy(const ManagedMemoryPolicy& policy)
       OVERRIDE;
@@ -201,12 +197,12 @@ class CC_EXPORT LayerTreeHostImpl
 
   // OutputSurfaceClient implementation.
   virtual void SetNeedsRedrawRect(gfx::Rect rect) OVERRIDE;
-  virtual void OnVSyncParametersChanged(base::TimeTicks timebase,
-                                        base::TimeDelta interval) OVERRIDE;
   virtual void BeginFrame(base::TimeTicks frame_time)
       OVERRIDE;
   virtual void OnSendFrameToParentCompositorAck(const CompositorFrameAck& ack)
       OVERRIDE;
+  virtual void DidLoseOutputSurface() OVERRIDE;
+  virtual void OnSwapBuffersComplete() OVERRIDE;
 
   // Called from LayerTreeImpl.
   void OnCanDrawStateChangedForTree();