cc: Avoid expensive RenderingStats collection.

cc/content_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/content_layer.h"
 
 #include "base/auto_reset.h"
 #include "base/metrics/histogram.h"
 #include "base/time.h"
 #include "cc/bitmap_content_layer_updater.h"
@@ skipping 48 matching lines @@
 }
 
 void ContentLayer::setTexturePriorities(const PriorityCalculator& priorityCalc)
 {
     // Update the tile data before creating all the layer's tiles.
     updateTileSizeAndTilingOption();
 
     TiledLayer::setTexturePriorities(priorityCalc);
 }
 
-void ContentLayer::update(ResourceUpdateQueue& queue, const OcclusionTracker* occlusion, RenderingStats& stats)
+void ContentLayer::update(ResourceUpdateQueue& queue, const OcclusionTracker* occlusion, RenderingStats* stats)
 {
     {
         base::AutoReset<bool> ignoreSetNeedsCommit(&m_ignoreSetNeedsCommit, true);
 
         createUpdaterIfNeeded();
     }
 
     TiledLayer::update(queue, occlusion, stats);
     m_needsDisplay = false;
 }
@@ skipping 26 matching lines @@
 }
 
 void ContentLayer::setContentsOpaque(bool opaque)
 {
     Layer::setContentsOpaque(opaque);
     if (m_updater)
         m_updater->setOpaque(opaque);
 }
 
 }  // namespace cc