Pass accurate contentsScale to LayerImpl.

cc/image_layer.h

 // 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.
 
 #ifndef ImageLayerChromium_h
 #define ImageLayerChromium_h
 
 #include "cc/content_layer.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace cc {
 
 class ImageLayerUpdater;
 
 // A Layer that contains only an Image element.
 class ImageLayer : public TiledLayer {
 public:
     static scoped_refptr<ImageLayer> create();
 
     virtual bool drawsContent() const OVERRIDE;
     virtual void setTexturePriorities(const PriorityCalculator&) OVERRIDE;
     virtual void update(ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&) OVERRIDE;
-    virtual bool needsContentsScale() const OVERRIDE;
+    virtual float contentsScaleX() const OVERRIDE;
+    virtual float contentsScaleY() const OVERRIDE;
 
     void setBitmap(const SkBitmap& image);
 
 private:
     ImageLayer();
     virtual ~ImageLayer();
 
     void setTilingOption(TilingOption);
 
     virtual LayerUpdater* updater() const OVERRIDE;
     virtual void createUpdaterIfNeeded() OVERRIDE;
     virtual IntSize contentBounds() const OVERRIDE;
 
     SkBitmap m_bitmap;
 
     scoped_refptr<ImageLayerUpdater> m_updater;
 };
 
 }  // namespace cc
 
 #endif