Pass accurate contentsScale to LayerImpl.

cc/test/tiled_layer_test_common.h

 // Copyright 2012 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 CCTiledLayerTestCommon_h
 #define CCTiledLayerTestCommon_h
 
 #include "IntRect.h"
 #include "IntSize.h"
 #include "Region.h"
@@ skipping 98 matching lines @@
     cc::PrioritizedTextureManager* m_textureManager;
     cc::FloatRect m_lastNeedsDisplayRect;
 };
 
 class FakeTiledLayerWithScaledBounds : public FakeTiledLayer {
 public:
     explicit FakeTiledLayerWithScaledBounds(cc::PrioritizedTextureManager*);
 
     void setContentBounds(const cc::IntSize& contentBounds) { m_forcedContentBounds = contentBounds; }
     virtual cc::IntSize contentBounds() const OVERRIDE;
+    virtual float contentsScaleX() const OVERRIDE;
+    virtual float contentsScaleY() const OVERRIDE;
+    virtual void setContentsScale(float) OVERRIDE;
 
 protected:
     virtual ~FakeTiledLayerWithScaledBounds();
     cc::IntSize m_forcedContentBounds;
 };
 
 }
 #endif // CCTiledLayerTestCommon_h