Let AreVisibleResourcesReady return correct value for PictureImageLayerImpl

cc/layers/picture_image_layer_impl.h

 // Copyright 2013 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 CC_LAYERS_PICTURE_IMAGE_LAYER_IMPL_H_
 #define CC_LAYERS_PICTURE_IMAGE_LAYER_IMPL_H_
 
 #include "cc/layers/picture_layer_impl.h"
 
 namespace cc {
 
 class CC_EXPORT PictureImageLayerImpl : public PictureLayerImpl {
  public:
   static scoped_ptr<PictureImageLayerImpl> Create(LayerTreeImpl* tree_impl,
                                                   int id) {
     return make_scoped_ptr(new PictureImageLayerImpl(tree_impl, id));
   }
   virtual ~PictureImageLayerImpl();
 
   virtual const char* LayerTypeAsString() const OVERRIDE;
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(
       LayerTreeImpl* tree_impl) OVERRIDE;
 
  protected:
   PictureImageLayerImpl(LayerTreeImpl* tree_impl, int id);
 
+  virtual bool ShouldAdjustRasterScale(
+      bool animating_transform_to_screen) const OVERRIDE;
   virtual void CalculateRasterContentsScale(
       bool animating_transform_to_screen,
       float* raster_contents_scale,
-      float* low_res_raster_contents_scale) OVERRIDE;
+      float* low_res_raster_contents_scale) const OVERRIDE;
   virtual void GetDebugBorderProperties(
       SkColor* color, float* width) const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(PictureImageLayerImpl);
 };
 
 }
 
 #endif  // CC_LAYERS_PICTURE_IMAGE_LAYER_IMPL_H_