Adding hooks for gathering total pixels painted and rasterized stats.

cc/bitmap_canvas_layer_texture_updater.cc

Index: cc/bitmap_canvas_layer_texture_updater.cc
diff --git a/cc/bitmap_canvas_layer_texture_updater.cc b/cc/bitmap_canvas_layer_texture_updater.cc
index 6afc8a3eca56272ae4367a46421ae66e22846f2a..d9f16cf68d367e9cd8f48a40dca9f14c86dce283 100644
--- a/cc/bitmap_canvas_layer_texture_updater.cc
+++ b/cc/bitmap_canvas_layer_texture_updater.cc
@@ -7,6 +7,8 @@
 
 #include "BitmapCanvasLayerTextureUpdater.h"
 
+#include "cc/rendering_stats.h"
+
 #include "CCTextureUpdateQueue.h"
 #include "LayerPainterChromium.h"
 #include "PlatformColor.h"
@@ -63,6 +65,8 @@ 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);
 }