cc: Control defer_commits logic by Scheduler

cc/test/layer_tree_test.h

Index: cc/test/layer_tree_test.h
diff --git a/cc/test/layer_tree_test.h b/cc/test/layer_tree_test.h
index ba40e350d2dee3df9f0c221227a9485dc3e5d87e..6ddc4b660110498096ead6b93e30119363c4ff11 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -88,13 +88,13 @@ class TestHooks : public AnimationDelegate {
   virtual void DidCommit() {}
   virtual void DidCommitAndDrawFrame() {}
   virtual void DidCompleteSwapBuffers() {}
-  virtual void DidDeferCommit() {}
   virtual void DidSetVisibleOnImplTree(LayerTreeHostImpl* host_impl,
                                        bool visible) {}
   virtual void ScheduleComposite() {}
   virtual void SendBeginFramesToChildren(const BeginFrameArgs& args) {}
 
   // Hooks for SchedulerClient.
+  virtual void WillBeginImplFrame(const BeginFrameArgs& args) {}
   virtual void ScheduledActionWillSendBeginMainFrame() {}
   virtual void ScheduledActionSendBeginMainFrame() {}
   virtual void ScheduledActionDrawAndSwapIfPossible() {}
@@ -141,6 +141,7 @@ class LayerTreeTest : public testing::Test, public TestHooks {
   void PostAddAnimationToMainThread(Layer* layer_to_receive_animation);
   void PostAddInstantAnimationToMainThread(Layer* layer_to_receive_animation);
   void PostAddLongAnimationToMainThread(Layer* layer_to_receive_animation);
+  void PostSetDeferCommitsToMainThread(bool defer_commits);
   void PostSetNeedsCommitToMainThread();
   void PostSetNeedsUpdateLayersToMainThread();
   void PostSetNeedsRedrawToMainThread();
@@ -166,6 +167,7 @@ class LayerTreeTest : public testing::Test, public TestHooks {
 
   virtual void DispatchAddAnimation(Layer* layer_to_receive_animation,
                                     double animation_duration);
+  void DispatchSetDeferCommits(bool defer_commits);
   void DispatchSetNeedsCommit();
   void DispatchSetNeedsUpdateLayers();
   void DispatchSetNeedsRedraw();