cc: Don't add new tilings while syncing a tiling.

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();
 
   // LayerImpl overrides.
   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 RecalculateRasterScales(bool animating_transform_to_screen,
-                                       float maximum_animation_contents_scale)
-      OVERRIDE;
+  virtual bool ShouldAdjustRasterScale() const OVERRIDE;
+  virtual void RecalculateRasterScales() OVERRIDE;
   virtual void GetDebugBorderProperties(
       SkColor* color, float* width) const OVERRIDE;
 
   virtual void UpdateIdealScales() OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PictureImageLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_PICTURE_IMAGE_LAYER_IMPL_H_