Adding hooks for gathering total pixels painted and rasterized stats.

cc/BitmapCanvasLayerTextureUpdater.cpp

Index: cc/BitmapCanvasLayerTextureUpdater.cpp
diff --git a/cc/BitmapCanvasLayerTextureUpdater.cpp b/cc/BitmapCanvasLayerTextureUpdater.cpp
index 35fb5a0eb3026e44db35f99f64045cfdaeae0995..cf33583cd218b3d858be5cec0adef0d5df2ea7eb 100644
--- a/cc/BitmapCanvasLayerTextureUpdater.cpp
+++ b/cc/BitmapCanvasLayerTextureUpdater.cpp
@@ -9,6 +9,8 @@
 
 #include "BitmapCanvasLayerTextureUpdater.h"
 
+#include "CCRenderingStats.h"
+
 #include "LayerPainterChromium.h"
 #include "PlatformColor.h"
 #include "skia/ext/platform_canvas.h"
@@ -64,6 +66,8 @@ void BitmapCanvasLayerTextureUpdater::prepareToUpdate(const IntRect& contentRect
         m_canvas = adoptPtr(skia::CreateBitmapCanvas(m_canvasSize.width(), m_canvasSize.height(), m_opaque));
     }
 
+    stats.totalPixelsRasterized += contentRect.width() * contentRect.height();
+
     paintContents(m_canvas.get(), contentRect, contentsWidthScale, contentsHeightScale, resultingOpaqueRect, stats);
 }