cc: Give TilingData back a Size instead of a Rect.

cc/resources/picture_layer_tiling.h

Index: cc/resources/picture_layer_tiling.h
diff --git a/cc/resources/picture_layer_tiling.h b/cc/resources/picture_layer_tiling.h
index f2726d8301f563d75d2e09f5de9f55ec60c49f83..457632c63aadb091d369ceb4b95e5a17573b3215 100644
--- a/cc/resources/picture_layer_tiling.h
+++ b/cc/resources/picture_layer_tiling.h
@@ -135,7 +135,7 @@ class CC_EXPORT PictureLayerTiling {
   void set_resolution(TileResolution resolution) { resolution_ = resolution; }
   TileResolution resolution() const { return resolution_; }
 
-  gfx::Rect TilingRect() const;
+  gfx::Size tiling_size() const { return tiling_data_.tiling_size(); }
   gfx::Rect live_tiles_rect() const { return live_tiles_rect_; }
   gfx::Size tile_size() const { return tiling_data_.max_texture_size(); }
   float contents_scale() const { return contents_scale_; }
@@ -146,7 +146,7 @@ class CC_EXPORT PictureLayerTiling {
   }
 
   void CreateAllTilesForTesting() {
-    SetLiveTilesRect(tiling_data_.tiling_rect());
+    SetLiveTilesRect(gfx::Rect(tiling_data_.tiling_size()));
   }
 
   const TilingData& TilingDataForTesting() const { return tiling_data_; }