c:: Give the raster source to the PictureLayerTilings.

cc/resources/picture_layer_tiling_set.h

Index: cc/resources/picture_layer_tiling_set.h
diff --git a/cc/resources/picture_layer_tiling_set.h b/cc/resources/picture_layer_tiling_set.h
index 8bc1084f81a46588deb146f55e68044f27cc0c15..e845a1ad291be573fbee31fcc3e4a02b9e5e62c4 100644
--- a/cc/resources/picture_layer_tiling_set.h
+++ b/cc/resources/picture_layer_tiling_set.h
@@ -55,6 +55,7 @@ class CC_EXPORT PictureLayerTilingSet {
                       PictureLayerTilingSet* recycled_twin_set);
   void RemoveNonIdealTilings();
 
+  // TODO(danakj): Pass scoped_refptr<RasterSource> instead of raw pointer.
   void UpdateTilingsToCurrentRasterSource(RasterSource* raster_source,
                                           const PictureLayerTilingSet* twin_set,
                                           const Region& layer_invalidation,
@@ -62,7 +63,7 @@ class CC_EXPORT PictureLayerTilingSet {
                                           float maximum_contents_scale);
 
   PictureLayerTiling* AddTiling(float contents_scale,
-                                const gfx::Size& layer_bounds);
+                                scoped_refptr<RasterSource> raster_source);
   size_t num_tilings() const { return tilings_.size(); }
   int NumHighResTilings() const;
   PictureLayerTiling* tiling_at(size_t idx) { return tilings_[idx]; }