[WIP] cc: Plumb frame timing info without using a commit.

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 5c0babe00d0d94335f123b568180d51698558789..47e3e486dbd88681e3ce11d996838771d455c0bd 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -126,6 +126,10 @@ class LayerTreeHostImplClient {
   // Called when output surface asks for a draw.
   virtual void OnDrawForOutputSurface() = 0;
 
+  virtual void PostFrameTimingEventsOnImplThread(
+      scoped_ptr<FrameTimingTracker::CompositeTimingSet> composite_events,
+      scoped_ptr<FrameTimingTracker::MainFrameTimingSet> main_frame_events) = 0;
+
  protected:
   virtual ~LayerTreeHostImplClient() {}
 };
@@ -537,6 +541,11 @@ class CC_EXPORT LayerTreeHostImpl
       const BeginFrameArgs& start_of_main_frame_args,
       const BeginFrameArgs& expected_next_main_frame_args);
 
+  // Post the given frame timing events to the requester.
+  void PostFrameTimingEvents(
+      scoped_ptr<FrameTimingTracker::CompositeTimingSet> composite_events,
+      scoped_ptr<FrameTimingTracker::MainFrameTimingSet> main_frame_events);
+
  protected:
   LayerTreeHostImpl(
       const LayerTreeSettings& settings,