Adding hooks for gathering total pixels painted and rasterized stats.

cc/rendering_stats.h

Index: cc/rendering_stats.h
diff --git a/cc/rendering_stats.h b/cc/rendering_stats.h
index fb178a89722fe38fb7fd69a483c6023b305e44c1..fa797207f2b5139c0aa10adde1f95762512ad248 100644
--- a/cc/rendering_stats.h
+++ b/cc/rendering_stats.h
@@ -16,21 +16,12 @@ struct CCRenderingStats {
     double totalRasterizeTimeInSeconds;
     double totalCommitTimeInSeconds;
     size_t totalCommitCount;
+    int64_t totalPixelsPainted;
+    int64_t totalPixelsRasterized;
     size_t numImplThreadScrolls;
     size_t numMainThreadScrolls;
 
-    CCRenderingStats()
-        : numAnimationFrames(0)
-        , numFramesSentToScreen(0)
-        , droppedFrameCount(0)
-        , totalPaintTimeInSeconds(0)
-        , totalRasterizeTimeInSeconds(0)
-        , totalCommitTimeInSeconds(0)
-        , totalCommitCount(0)
-        , numImplThreadScrolls(0)
-        , numMainThreadScrolls(0)
-    {
-    }
+    CCRenderingStats();
 };
 
 }