cc: Record statistics about approximated content.

cc/debug/rendering_stats.h

 // Copyright 2012 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.
 
 #ifndef CC_DEBUG_RENDERING_STATS_H_
 #define CC_DEBUG_RENDERING_STATS_H_
 
 #include "base/basictypes.h"
 #include "base/time/time.h"
 #include "cc/base/cc_export.h"
@@ skipping 17 matching lines @@
 };
 
 struct CC_EXPORT ImplThreadRenderingStats {
   // Note: when adding new members, please remember to update EnumerateFields
   // and Add in rendering_stats.cc.
 
   int64 frame_count;
   base::TimeDelta rasterize_time;
   base::TimeDelta analysis_time;
   int64 rasterized_pixel_count;
+  int64 visible_content_area;
+  int64 approximated_visible_content_area;
 
   ImplThreadRenderingStats();
   scoped_refptr<base::debug::ConvertableToTraceFormat> AsTraceableData() const;
   void Add(const ImplThreadRenderingStats& other);
 };
 
 struct CC_EXPORT RenderingStats {
   MainThreadRenderingStats main_stats;
   ImplThreadRenderingStats impl_stats;
 
   // Add fields of |other| to the fields in this structure.
   void Add(const RenderingStats& other);
 };
 
 }  // namespace cc
 
 #endif  // CC_DEBUG_RENDERING_STATS_H_