cc: Avoid expensive RenderingStats collection.

cc/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/image_layer.h"
 
 #include "base/compiler_specific.h"
 #include "cc/image_layer_updater.h"
 #include "cc/layer_updater.h"
 #include "cc/layer_tree_host.h"
@@ skipping 30 matching lines @@
 }
 
 void ImageLayer::setTexturePriorities(const PriorityCalculator& priorityCalc)
 {
     // Update the tile data before creating all the layer's tiles.
     updateTileSizeAndTilingOption();
 
     TiledLayer::setTexturePriorities(priorityCalc);
 }
 
-void ImageLayer::update(ResourceUpdateQueue& queue, const OcclusionTracker* occlusion, RenderingStats& stats)
+void ImageLayer::update(ResourceUpdateQueue& queue, const OcclusionTracker* occlusion, RenderingStats* stats)
 {
     createUpdaterIfNeeded();
     if (m_needsDisplay) {
         m_updater->setBitmap(m_bitmap);
         updateTileSizeAndTilingOption();
         invalidateContentRect(gfx::Rect(gfx::Point(), contentBounds()));
         m_needsDisplay = false;
     }
     TiledLayer::update(queue, occlusion, stats);
 }
@@ skipping 37 matching lines @@
 }
 
 float ImageLayer::imageContentsScaleY() const
 {
     if (bounds().IsEmpty() || m_bitmap.height() == 0)
         return 1;
     return static_cast<float>(m_bitmap.height()) / bounds().height();
 }
 
 }  // namespace cc