cc: Avoid expensive RenderingStats collection.

cc/bitmap_skpicture_content_layer_updater.cc

Index: cc/bitmap_skpicture_content_layer_updater.cc
diff --git a/cc/bitmap_skpicture_content_layer_updater.cc b/cc/bitmap_skpicture_content_layer_updater.cc
index 5c0e512c1893899d5d744cd5566b24f9490e1c7b..dab97b13224b872c5aa589cd7872dfa425166775 100644
--- a/cc/bitmap_skpicture_content_layer_updater.cc
+++ b/cc/bitmap_skpicture_content_layer_updater.cc
@@ -20,16 +20,19 @@ BitmapSkPictureContentLayerUpdater::Resource::Resource(BitmapSkPictureContentLay
 {
 }
 
-void BitmapSkPictureContentLayerUpdater::Resource::update(ResourceUpdateQueue& queue, const gfx::Rect& sourceRect, const gfx::Vector2d& destOffset, bool partialUpdate, RenderingStats& stats)
+void BitmapSkPictureContentLayerUpdater::Resource::update(ResourceUpdateQueue& queue, const gfx::Rect& sourceRect, const gfx::Vector2d& destOffset, bool partialUpdate, RenderingStats* stats)
 {
     m_bitmap.setConfig(SkBitmap::kARGB_8888_Config, sourceRect.width(), sourceRect.height());
     m_bitmap.allocPixels();
     m_bitmap.setIsOpaque(m_updater->layerIsOpaque());
     SkDevice device(m_bitmap);
     SkCanvas canvas(&device);
-    base::TimeTicks paintBeginTime = base::TimeTicks::Now();
+    base::TimeTicks paintBeginTime;
+    if (stats)
+      paintBeginTime = base::TimeTicks::Now();
     updater()->paintContentsRect(&canvas, sourceRect, stats);
-    stats.totalPaintTime += base::TimeTicks::Now() - paintBeginTime;
+    if (stats)
+      stats->totalPaintTime += base::TimeTicks::Now() - paintBeginTime;
 
     ResourceUpdate upload = ResourceUpdate::Create(
         texture(), &m_bitmap, sourceRect, sourceRect, destOffset);
@@ -58,15 +61,19 @@ scoped_ptr<LayerUpdater::Resource> BitmapSkPictureContentLayerUpdater::createRes
     return scoped_ptr<LayerUpdater::Resource>(new Resource(this, PrioritizedResource::create(manager)));
 }
 
-void BitmapSkPictureContentLayerUpdater::paintContentsRect(SkCanvas* canvas, const gfx::Rect& sourceRect, RenderingStats& stats)
+void BitmapSkPictureContentLayerUpdater::paintContentsRect(SkCanvas* canvas, const gfx::Rect& sourceRect, RenderingStats* stats)
 {
     // Translate the origin of contentRect to that of sourceRect.
     canvas->translate(contentRect().x() - sourceRect.x(),
                       contentRect().y() - sourceRect.y());
-    base::TimeTicks rasterizeBeginTime = base::TimeTicks::Now();
+    base::TimeTicks rasterizeBeginTime;
+    if (stats)
+      rasterizeBeginTime = base::TimeTicks::Now();
     drawPicture(canvas);
-    stats.totalRasterizeTime += base::TimeTicks::Now() - rasterizeBeginTime;
-    stats.totalPixelsRasterized += sourceRect.width() * sourceRect.height();
+    if (stats) {
+      stats->totalRasterizeTime += base::TimeTicks::Now() - rasterizeBeginTime;
+      stats->totalPixelsRasterized += sourceRect.width() * sourceRect.height();
+    }
 }
 
 }  // namespace cc