Add duration estimation data to RenderingStats.

cc/debug/rendering_stats.h

Index: cc/debug/rendering_stats.h
diff --git a/cc/debug/rendering_stats.h b/cc/debug/rendering_stats.h
index bd3b7c7244282fdd6888ae31fc67d0ea41de8758..f0ee8e106a14a16534ef245e5f4208a4625c3306 100644
--- a/cc/debug/rendering_stats.h
+++ b/cc/debug/rendering_stats.h
@@ -5,6 +5,8 @@
 #ifndef CC_DEBUG_RENDERING_STATS_H_
 #define CC_DEBUG_RENDERING_STATS_H_
 
+#include <list>
+
 #include "base/basictypes.h"
 #include "base/time/time.h"
 #include "cc/base/cc_export.h"
@@ -27,6 +29,17 @@ struct CC_EXPORT MainThreadRenderingStats {
   void Add(const MainThreadRenderingStats& other);
 };
 
+// Stores a sequence of TimeDelta objects.
+class CC_EXPORT ImplThreadRenderingStatsAccumulated {

[ernstm, 2014/07/14 13:12:39]

If we expect to use more of these list values in the future, then I would prefer
a more generic name (they could be used in MainThreadRenderingStats as well). It
is basically a list of TimeDeltas; Maybe call it TimeDeltaList?

[Dominik Grewe, 2014/07/14 13:37:52]

Good point. Done.

+ public:
+  void Append(base::TimeDelta value);
+  scoped_ptr<base::Value> AsValueInMilliseconds() const;
+  void Add(const ImplThreadRenderingStatsAccumulated& other);
+
+ private:
+  std::list<base::TimeDelta> values;
+};
+
 struct CC_EXPORT ImplThreadRenderingStats {
   // Note: when adding new members, please remember to update EnumerateFields
   // and Add in rendering_stats.cc.
@@ -38,6 +51,14 @@ struct CC_EXPORT ImplThreadRenderingStats {
   int64 visible_content_area;
   int64 approximated_visible_content_area;
 
+  ImplThreadRenderingStatsAccumulated draw_duration;
+  ImplThreadRenderingStatsAccumulated draw_duration_estimate;
+  ImplThreadRenderingStatsAccumulated begin_main_frame_to_commit_duration;
+  ImplThreadRenderingStatsAccumulated
+      begin_main_frame_to_commit_duration_estimate;
+  ImplThreadRenderingStatsAccumulated commit_to_activate_duration;
+  ImplThreadRenderingStatsAccumulated commit_to_activate_duration_estimate;
+
   ImplThreadRenderingStats();
   scoped_refptr<base::debug::ConvertableToTraceFormat> AsTraceableData() const;
   void Add(const ImplThreadRenderingStats& other);