cc: Control defer_commits logic by Scheduler

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 d6d53a8440a5611546a7a40b439f700113d2c203..4cd4d34e7656f58bc85176b691651e71c1bbd912 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -78,7 +78,6 @@ class CC_EXPORT ThreadProxy : public Proxy,
 
     RendererCapabilities renderer_capabilities_main_thread_copy;
 
-    scoped_ptr<BeginMainFrameAndCommitState> pending_deferred_commit;
     base::WeakPtrFactory<ThreadProxy> weak_factory;
   };
 
@@ -278,6 +277,7 @@ class CC_EXPORT ThreadProxy : public Proxy,
   void MainThreadHasStoppedFlingingOnImplThread();
   void SetInputThrottledUntilCommitOnImplThread(bool is_throttled);
   void SetDebugStateOnImplThread(const LayerTreeDebugState& debug_state);
+  void SetDeferCommitsOnImplThread(bool defer_commits) const;
 
   LayerTreeHost* layer_tree_host();
   const LayerTreeHost* layer_tree_host() const;