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 2914cfcf8ee65dfd8896f57c480f8db709f15df1..3438525318b3bc6864e1340207bebb36e5e0416f 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -85,7 +85,6 @@ 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() {}
@@ -134,6 +133,7 @@ class LayerTreeTest : public testing::Test, public TestHooks {
   virtual void EndTest();
   void EndTestAfterDelayMs(int delay_milliseconds);
 
+  void PostSetDeferCommitsToMainThread(bool defer_commits);
   void PostAddAnimationToMainThread(Layer* layer_to_receive_animation);
   void PostAddInstantAnimationToMainThread(Layer* layer_to_receive_animation);
   void PostAddLongAnimationToMainThread(Layer* layer_to_receive_animation);
@@ -165,6 +165,7 @@ class LayerTreeTest : public testing::Test, public TestHooks {
   void DispatchSetNextCommitForcesRedraw();
   void DispatchDidAddAnimation();
   void DispatchCompositeImmediately();
+  void DispatchSetDeferCommits(bool defer_commits);
 
   virtual void AfterTest() = 0;
   virtual void WillBeginTest();