cc : Don't draw animating layers which are transparent but raster them.

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 d5f2c312e3f03e43ee9a26c1db71e47c0486d456..8080c57afb3446bd07f2ac00ff77b4758ea965c5 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -372,11 +372,6 @@ void LayerTreeImpl::SetPropertyTrees(PropertyTrees* property_trees) {
   property_trees_.is_main_thread = false;
   property_trees_.is_active = IsActiveTree();
   property_trees_.transform_tree.set_source_to_parent_updates_allowed(false);
-  // The value of some effect node properties (like is_drawn) depends on
-  // whether we are on the active tree or not. So, we need to update the
-  // effect tree.
-  if (IsActiveTree())
-    property_trees_.effect_tree.set_needs_update(true);
 }
 
 void LayerTreeImpl::PushPropertiesTo(LayerTreeImpl* target_tree) {