cc: Add PictureLayerTiling for impl-side painting

cc/picture_layer_impl.h

Index: cc/picture_layer_impl.h
diff --git a/cc/picture_layer_impl.h b/cc/picture_layer_impl.h
index e2c7675bdf7e5593e1dfada4958428ec631a3f15..76b71b132a04b4e10f521a18c65c56deb510ec52 100644
--- a/cc/picture_layer_impl.h
+++ b/cc/picture_layer_impl.h
@@ -6,14 +6,17 @@
 #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)
   {
@@ -26,9 +29,20 @@ public:
   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;