Remove owning_id from EffectNode and replace it by an opaque stable_id

cc/layers/layer.cc

 // Copyright 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/layer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 475 matching lines @@
   if (inputs_.opacity == opacity)
     return;
   // We need to force a property tree rebuild when opacity changes from 1 to a
   // non-1 value or vice-versa as render surfaces can change.
   bool force_rebuild = opacity == 1.f || inputs_.opacity == 1.f;
   inputs_.opacity = opacity;
   SetSubtreePropertyChanged();
   if (layer_tree_host_ && !force_rebuild) {
     PropertyTrees* property_trees = layer_tree_host_->property_trees();
     if (EffectNode* node =
-            property_trees->effect_tree.UpdateNodeFromOwningLayerId(id())) {
+            property_trees->effect_tree.Node(effect_tree_index_)) {
       node->opacity = opacity;
       node->effect_changed = true;
       property_trees->effect_tree.set_needs_update(true);
     }
   }
   if (force_rebuild)
     SetPropertyTreesNeedRebuild();
   SetNeedsCommit();
 }
 
@@ skipping 934 matching lines @@
       ->subtree_has_copy_request;
 }
 
 gfx::Transform Layer::ScreenSpaceTransform() const {
   DCHECK_NE(transform_tree_index_, TransformTree::kInvalidNodeId);
   return draw_property_utils::ScreenSpaceTransform(
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 }  // namespace cc