cc: Rework how picture layer tiling set gets into raster queues.

cc/resources/picture_layer_tiling_set.cc

Index: cc/resources/picture_layer_tiling_set.cc
diff --git a/cc/resources/picture_layer_tiling_set.cc b/cc/resources/picture_layer_tiling_set.cc
index 7c36a3ff552e40ccf701abdb466e489560500562..64a940ac002a2f308490c237f7b484f2fd70b69a 100644
--- a/cc/resources/picture_layer_tiling_set.cc
+++ b/cc/resources/picture_layer_tiling_set.cc
@@ -321,6 +321,10 @@ void PictureLayerTilingSet::GetAllTilesForTracing(
     tiling->GetAllTilesForTracing(tiles);
 }
 
+bool PictureLayerTilingSet::HasValidTilePriorities() const {
+  return client()->HasValidTilePriorities();
+}
+
 PictureLayerTilingSet::CoverageIterator::CoverageIterator(
     const PictureLayerTilingSet* set,
     float contents_scale,