cc: Give TilingData a Rect instead of a Size

cc/resources/picture_pile_base.h

Index: cc/resources/picture_pile_base.h
diff --git a/cc/resources/picture_pile_base.h b/cc/resources/picture_pile_base.h
index be9955e3fd0f916c29d4449f602807b2a9b6cd85..eff788786de03ac5deeaf7facfc18be6a4b22cbd 100644
--- a/cc/resources/picture_pile_base.h
+++ b/cc/resources/picture_pile_base.h
@@ -29,8 +29,8 @@ class CC_EXPORT PicturePileBase : public base::RefCounted<PicturePileBase> {
   explicit PicturePileBase(const PicturePileBase* other);
   PicturePileBase(const PicturePileBase* other, unsigned thread_index);
 
-  void Resize(const gfx::Size& size);
-  gfx::Size size() const { return tiling_.total_size(); }
+  void SetTilingRect(const gfx::Rect& tiling_rect);
+  gfx::Rect tiling_rect() const { return tiling_.tiling_rect(); }
   void SetMinContentsScale(float min_contents_scale);
 
   int num_tiles_x() const { return tiling_.num_tiles_x(); }