cc: Record frame timing composite events in the tracker.

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 f8521c96e353adb54b369cbeed35d9b0809b2908..f0fa245ab2194c7494c053e1b32cd9b03359e7fb 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -18,6 +18,7 @@
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/synced_property.h"
+#include "cc/debug/frame_timing_tracker.h"
 #include "cc/debug/micro_benchmark_controller_impl.h"
 #include "cc/input/input_handler.h"
 #include "cc/input/layer_scroll_offset_delegate.h"
@@ -512,6 +513,10 @@ class CC_EXPORT LayerTreeHostImpl
 
   bool prepare_tiles_needed() const { return tile_priorities_dirty_; }
 
+  FrameTimingTracker* frame_timing_tracker() {
+    return frame_timing_tracker_.get();
+  }
+
  protected:
   LayerTreeHostImpl(
       const LayerTreeSettings& settings,
@@ -730,6 +735,9 @@ class CC_EXPORT LayerTreeHostImpl
   bool requires_high_res_to_draw_;
   bool required_for_draw_tile_is_top_of_raster_queue_;
 
+  scoped_ptr<FrameTimingTracker> frame_timing_tracker_;
+  std::vector<FrameTimingTracker::FrameAndRectIds> current_composite_events_;
+
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };