Remove owning_id from EffectNode and replace it by an opaque stable_id

third_party/WebKit/Source/platform/graphics/CompositorMutableState.cpp

 // Copyright 2016 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 "platform/graphics/CompositorMutableState.h"
 
 #include "cc/layers/layer_impl.h"
+#include "cc/trees/effect_node.h"
 #include "cc/trees/layer_tree_impl.h"
+#include "cc/trees/property_tree.h"
 #include "platform/graphics/CompositorMutation.h"
 
 namespace blink {
 CompositorMutableState::CompositorMutableState(CompositorMutation* mutation,
                                                cc::LayerImpl* main,
                                                cc::LayerImpl* scroll)
     : mutation_(mutation), main_layer_(main), scroll_layer_(scroll) {}
 
 CompositorMutableState::~CompositorMutableState() {}
 
 double CompositorMutableState::Opacity() const {
-  return main_layer_->Opacity();
+  return main_layer_->layer_tree_impl()
+      ->property_trees()
+      ->effect_tree.Node(main_layer_->effect_tree_index())
+      ->opacity;
 }
 
 void CompositorMutableState::SetOpacity(double opacity) {
   if (!main_layer_)
     return;
   main_layer_->layer_tree_impl()->SetOpacityMutated(main_layer_->element_id(),
                                                     opacity);
   mutation_->SetOpacity(opacity);
 }
 
@@ skipping 38 matching lines @@
   offset.set_y(scroll_top);
   scroll_layer_->layer_tree_impl()
       ->property_trees()
       ->scroll_tree.OnScrollOffsetAnimated(
           scroll_layer_->id(), scroll_layer_->scroll_tree_index(), offset,
           scroll_layer_->layer_tree_impl());
   mutation_->SetScrollTop(scroll_top);
 }
 
 }  // namespace blink