cc: Add PictureLayerTiling for impl-side painting

cc/picture_layer_impl.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 CC_PICTURE_LAYER_IMPL_H_
 #define CC_PICTURE_LAYER_IMPL_H_
 
 #include "cc/layer_impl.h"
+#include "cc/picture_layer_tiling.h"
 #include "cc/picture_pile.h"
+#include "cc/scoped_ptr_vector.h"
 
 namespace cc {
 
 struct AppendQuadsData;
 class QuadSink;
 
-class CC_EXPORT PictureLayerImpl : public LayerImpl {
+class CC_EXPORT PictureLayerImpl : public LayerImpl,
+                                   public PictureLayerTilingClient {
 public:
   static scoped_ptr<PictureLayerImpl> create(int id)
   {
       return make_scoped_ptr(new PictureLayerImpl(id));
   }
   virtual ~PictureLayerImpl();
 
   // LayerImpl overrides.
   virtual const char* layerTypeAsString() const OVERRIDE;
   virtual void appendQuads(QuadSink&, AppendQuadsData&) OVERRIDE;
   virtual void dumpLayerProperties(std::string*, int indent) const OVERRIDE;
 
+  // PictureLayerTilingClient overrides.
+  virtual scoped_refptr<Tile> CreateTile(PictureLayerTiling*,
+                                         gfx::Rect) OVERRIDE;
+
+  // PushPropertiesTo active tree => pending tree
+  void SyncFromActiveLayer(const PictureLayerImpl* other);
+
+  // Called post-calcDraw.
+  void Update();
+
 protected:
   PictureLayerImpl(int id);
 
+  ScopedPtrVector<PictureLayerTiling> tilings_;
   PicturePile pile_;
 
   friend class PictureLayer;
   DISALLOW_COPY_AND_ASSIGN(PictureLayerImpl);
 };
 
 }
 
 #endif  // CC_PICTURE_LAYER_IMPL_H_