cc: Block commit on activate by setting a flag on LayerTreeHost.

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index 619c18e6574fe057bb1356a87ff754d68c3196b5..be0ab06c868f6ac6fd5c95f822d4f8ad5689bea1 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -191,6 +191,8 @@ class CC_EXPORT LayerTreeHost : NON_EXPORTED_BASE(public RateLimiterClient) {
   void SetNeedsRedrawRect(gfx::Rect damage_rect);
   bool CommitRequested() const;
 
+  void SetNextCommitWaitsForActivation();
+
   void SetAnimationEvents(scoped_ptr<AnimationEventsVector> events,
                           base::Time wall_clock_time);
 
@@ -266,8 +268,6 @@ class CC_EXPORT LayerTreeHost : NON_EXPORTED_BASE(public RateLimiterClient) {
     return animation_registrar_.get();
   }
 
-  bool BlocksPendingCommit() const;
-
   // Obtains a thorough dump of the LayerTreeHost as a value.
   scoped_ptr<base::Value> AsValue() const;