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

cc/test/fake_picture_layer_tiling_client.cc

Index: cc/test/fake_picture_layer_tiling_client.cc
diff --git a/cc/test/fake_picture_layer_tiling_client.cc b/cc/test/fake_picture_layer_tiling_client.cc
index cc308e501425a34cd692167e686ce62492457fbc..4c692c8f5adcd96ef805907002a189250a053477 100644
--- a/cc/test/fake_picture_layer_tiling_client.cc
+++ b/cc/test/fake_picture_layer_tiling_client.cc
@@ -81,6 +81,10 @@ WhichTree FakePictureLayerTilingClient::GetTree() const {
   return tree_;
 }
 
+bool FakePictureLayerTilingClient::HasValidTilePriorities() const {
+  return true;
+}
+
 bool FakePictureLayerTilingClient::RequiresHighResToDraw() const {
   return false;
 }