cc: Pass ideal contents scale to PictureLayerTiling UpdateTilePriorities.

cc/layers/picture_layer_impl.cc

Index: cc/layers/picture_layer_impl.cc
diff --git a/cc/layers/picture_layer_impl.cc b/cc/layers/picture_layer_impl.cc
index 5452941793305803df01e77e42039b1e5272a1f4..ec001a3606540552e6e7024312fef02d075c785e 100644
--- a/cc/layers/picture_layer_impl.cc
+++ b/cc/layers/picture_layer_impl.cc
@@ -425,8 +425,6 @@ void PictureLayerImpl::UpdateTiles() {
   was_screen_space_transform_animating_ =
       draw_properties().screen_space_transform_is_animating;
 
-  // TODO(sohanjg): Avoid needlessly update priorities when syncing to a
-  // non-updated tree which will then be updated immediately afterwards.
   should_update_tile_priorities_ = true;
 
   UpdateTilePriorities();
@@ -472,11 +470,9 @@ void PictureLayerImpl::UpdateTilePriorities() {
   WhichTree tree =
       layer_tree_impl()->IsActiveTree() ? ACTIVE_TREE : PENDING_TREE;
   for (size_t i = 0; i < tilings_->num_tilings(); ++i) {
-    // TODO(sohanjg): Passing MaximumContentsScale as layer contents scale
-    // in UpdateTilePriorities is wrong and should be ideal contents scale.
     tilings_->tiling_at(i)->UpdateTilePriorities(tree,
                                                  visible_layer_rect,
-                                                 MaximumTilingContentsScale(),
+                                                 ideal_contents_scale_,
                                                  current_frame_time_in_seconds);
   }