cc: Add MainAndImplFrameTimeDelta UMA.

cc/scheduler/compositor_timing_history.h

Index: cc/scheduler/compositor_timing_history.h
diff --git a/cc/scheduler/compositor_timing_history.h b/cc/scheduler/compositor_timing_history.h
index b64dc0561a52cb8c6a2f32c65ebb068598f624aa..e25d93e3f8cc1e71c216ce5ec593ebac8274639b 100644
--- a/cc/scheduler/compositor_timing_history.h
+++ b/cc/scheduler/compositor_timing_history.h
@@ -54,7 +54,8 @@ class CC_EXPORT CompositorTimingHistory {
   void WillBeginImplFrame(bool new_active_tree_is_likely);
   void WillFinishImplFrame(bool needs_redraw);
   void BeginImplFrameNotExpectedSoon();
-  void WillBeginMainFrame(bool on_critical_path);
+  void WillBeginMainFrame(bool on_critical_path,
+                          base::TimeTicks main_frame_time);
   void BeginMainFrameStarted(base::TimeTicks main_thread_start_time);
   void BeginMainFrameAborted();
   void DidCommit();
@@ -64,7 +65,9 @@ class CC_EXPORT CompositorTimingHistory {
   void WillActivate();
   void DidActivate();
   void WillDraw();
-  void DidDraw(bool used_new_active_tree);
+  void DidDraw(bool used_new_active_tree,
+               bool main_thread_missed_last_deadline,
+               base::TimeTicks impl_frame_time);
   void DidSwapBuffers();
   void DidSwapBuffersComplete();
   void DidSwapBuffersReset();
@@ -100,11 +103,14 @@ class CC_EXPORT CompositorTimingHistory {
   RollingTimeDeltaHistory draw_duration_history_;
 
   bool begin_main_frame_on_critical_path_;
+  base::TimeTicks begin_main_frame_frame_time_;
   base::TimeTicks begin_main_frame_sent_time_;
   base::TimeTicks begin_main_frame_start_time_;
   base::TimeTicks begin_main_frame_end_time_;
+  base::TimeTicks pending_tree_main_frame_time_;
   base::TimeTicks prepare_tiles_start_time_;
   base::TimeTicks activate_start_time_;
+  base::TimeTicks active_tree_main_frame_time_;
   base::TimeTicks draw_start_time_;
   base::TimeTicks swap_start_time_;