cc: Give non-drawing layers that are rasterized a lower priority.

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index d1bfa3583abdf637c4155c7f4e1b8172ccbe179b..1e7a2d4e6847544ab5aabbdaafd356f212de43fb 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -1144,7 +1144,7 @@ bool LayerTreeImpl::UpdateDrawProperties(bool update_lcd_text) {
     size_t layers_updated_count = 0;
     bool tile_priorities_updated = false;
     for (PictureLayerImpl* layer : picture_layers_) {
-      if (!layer->contributes_to_drawn_render_surface())
+      if (!layer->HasValidTilePriorities())
         continue;
       ++layers_updated_count;
       tile_priorities_updated |= layer->UpdateTiles();