cc: Avoid expensive RenderingStats collection.

cc/picture_image_layer.cc

 // Copyright 2010 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.
 
 #include "cc/picture_image_layer.h"
 
 #include "third_party/skia/include/core/SkCanvas.h"
 
 namespace cc {
 
@@ skipping 21 matching lines @@
   if (bitmap.pixelRef() && bitmap.pixelRef() == bitmap_.pixelRef())
       return;
 
   bitmap_ = bitmap;
   setNeedsDisplay();
 }
 
 void PictureImageLayer::update(
     ResourceUpdateQueue& queue,
     const OcclusionTracker* tracker,
-    RenderingStats& stats) {
+    RenderingStats* stats) {
   if (bounds() != bounds_) {
     // Pictures are recorded in layer space, so if the layer size changes,
     // then the picture needs to be re-scaled, as a directly composited image
     // always fills its entire layer bounds.  This could be improved by
     // recording pictures of images at their actual resolution somehow.
     bounds_ = bounds();
     setNeedsDisplay();
   }
   PictureLayer::update(queue, tracker, stats);
 }
 
 void PictureImageLayer::paintContents(
     SkCanvas* canvas,
     const gfx::Rect& clip,
     gfx::RectF& opaque) {
   if (!bitmap_.width() || !bitmap_.height())
     return;
 
   SkScalar content_to_layer_scale_x = SkFloatToScalar(
       static_cast<float>(bounds().width()) / bitmap_.width());
   SkScalar content_to_layer_scale_y = SkFloatToScalar(
       static_cast<float>(bounds().height()) / bitmap_.height());
   canvas->scale(content_to_layer_scale_x, content_to_layer_scale_y);
 
   canvas->drawBitmap(bitmap_, 0, 0);
 }
 
 }  // namespace cc