cc: Separate the priority from the tile and put in new PrioritizedTile

cc/test/fake_picture_layer_impl.h

Index: cc/test/fake_picture_layer_impl.h
diff --git a/cc/test/fake_picture_layer_impl.h b/cc/test/fake_picture_layer_impl.h
index 353d22ed86316d43b1c5fbcb8b791fbba88ee1ff..1a9c6a66866c736f48c26e8a26ef2e2af67ba99e 100644
--- a/cc/test/fake_picture_layer_impl.h
+++ b/cc/test/fake_picture_layer_impl.h
@@ -125,11 +125,9 @@ class FakePictureLayerImpl : public PictureLayerImpl {
   void SetIsDrawnRenderSurfaceLayerListMember(bool is);
 
   void CreateAllTiles();
-  void SetAllTilesVisible();
   void SetAllTilesReady();
   void SetAllTilesReadyInTiling(PictureLayerTiling* tiling);
   void SetTileReady(Tile* tile);
-  void ResetAllTilesPriorities();
   PictureLayerTilingSet* GetTilings() { return tilings_.get(); }
 
   // Add the given tiling as a "used" tiling during AppendQuads. This ensures