Add duration estimation data to RenderingStats.

cc/trees/proxy_timing_history.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/proxy_timing_history.h"
 
 const size_t kDurationHistorySize = 60;
 const double kCommitAndActivationDurationEstimationPercentile = 50.0;
 const double kDrawDurationEstimationPercentile = 100.0;
 const int kDrawDurationEstimatePaddingInMicroseconds = 0;
@@ skipping 23 matching lines @@
 
 base::TimeDelta ProxyTimingHistory::CommitToActivateDurationEstimate() const {
   return commit_to_activate_duration_history_.Percentile(
       kCommitAndActivationDurationEstimationPercentile);
 }
 
 void ProxyTimingHistory::DidBeginMainFrame() {
   begin_main_frame_sent_time_ = base::TimeTicks::HighResNow();
 }
 
-void ProxyTimingHistory::DidCommit() {
+base::TimeDelta ProxyTimingHistory::DidCommit() {
   commit_complete_time_ = base::TimeTicks::HighResNow();
+  base::TimeDelta begin_main_frame_to_commit_duration =
+      commit_complete_time_ - begin_main_frame_sent_time_;
   begin_main_frame_to_commit_duration_history_.InsertSample(
-      commit_complete_time_ - begin_main_frame_sent_time_);
+      begin_main_frame_to_commit_duration);
+  return begin_main_frame_to_commit_duration;
 }
 
-void ProxyTimingHistory::DidActivatePendingTree() {
+base::TimeDelta ProxyTimingHistory::DidActivatePendingTree() {
+  base::TimeDelta commit_to_activate_duration =
+      base::TimeTicks::HighResNow() - commit_complete_time_;
   commit_to_activate_duration_history_.InsertSample(
-      base::TimeTicks::HighResNow() - commit_complete_time_);
+      commit_to_activate_duration);
+  return commit_to_activate_duration;
 }
 
 void ProxyTimingHistory::DidStartDrawing() {
   start_draw_time_ = base::TimeTicks::HighResNow();
 }
 
 base::TimeDelta ProxyTimingHistory::DidFinishDrawing() {
   base::TimeDelta draw_duration =
       base::TimeTicks::HighResNow() - start_draw_time_;
   draw_duration_history_.InsertSample(draw_duration);
   return draw_duration;
 }
 
 }  // namespace cc