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 b2b821f1c995c6ae48240e60ad9728408196cc35..68666f58143aeea18b66f7d0a0883387c02fbb64 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"
@@ -184,6 +185,7 @@ class CC_EXPORT LayerTreeHostImpl
 
     std::vector<gfx::Rect> occluding_screen_space_rects;
     std::vector<gfx::Rect> non_occluding_screen_space_rects;
+    std::vector<FrameTimingTracker::FrameAndRectIds> composite_events;
     RenderPassList render_passes;
     RenderPassIdHashMap render_passes_by_id;
     const LayerImplList* render_surface_layer_list;
@@ -513,6 +515,10 @@ 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,
@@ -731,6 +737,8 @@ class CC_EXPORT LayerTreeHostImpl
   bool requires_high_res_to_draw_;
   bool is_likely_to_require_a_draw_;
 
+  scoped_ptr<FrameTimingTracker> frame_timing_tracker_;
+
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };