Add duration estimation data to RenderingStats.

cc/trees/proxy_timing_history.h

Index: cc/trees/proxy_timing_history.h
diff --git a/cc/trees/proxy_timing_history.h b/cc/trees/proxy_timing_history.h
index 9230e8af04e972f75c802878dce3cedb982d8923..aa213b6bdb7dbaca33a8a81a84e56cca1a2bb919 100644
--- a/cc/trees/proxy_timing_history.h
+++ b/cc/trees/proxy_timing_history.h
@@ -6,12 +6,14 @@
 #define CC_TREES_PROXY_TIMING_HISTORY_H_
 
 #include "cc/base/rolling_time_delta_history.h"
+#include "cc/debug/rendering_stats_instrumentation.h"
 
 namespace cc {
 
 class ProxyTimingHistory {
  public:
-  ProxyTimingHistory();
+  explicit ProxyTimingHistory(
+      RenderingStatsInstrumentation* rendering_stats_instrumentation);
   ~ProxyTimingHistory();
 
   base::TimeDelta DrawDurationEstimate() const;
@@ -22,10 +24,12 @@ class ProxyTimingHistory {
   void DidCommit();
   void DidActivateSyncTree();
   void DidStartDrawing();
-  // Returns draw duration.
-  base::TimeDelta DidFinishDrawing();
+  void DidFinishDrawing();
 
  protected:
+  void AddDrawDurationUMA(base::TimeDelta draw_duration,
+                          base::TimeDelta draw_duration_estimate);
+
   RollingTimeDeltaHistory draw_duration_history_;
   RollingTimeDeltaHistory begin_main_frame_to_commit_duration_history_;
   RollingTimeDeltaHistory commit_to_activate_duration_history_;
@@ -33,6 +37,8 @@ class ProxyTimingHistory {
   base::TimeTicks begin_main_frame_sent_time_;
   base::TimeTicks commit_complete_time_;
   base::TimeTicks start_draw_time_;
+
+  RenderingStatsInstrumentation* rendering_stats_instrumentation_;
 };
 
 }  // namespace cc