cc: Move Layer Id to Node Map to Individual Property Tree Private

cc/input/scrollbar_animation_controller.cc

 // Copyright 2014 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/input/scrollbar_animation_controller.h"
 
 #include <algorithm>
 
 #include "base/time/time.h"
 #include "cc/trees/layer_tree_impl.h"
@@ skipping 328 matching lines @@
 }
 
 void ScrollbarAnimationController::ApplyOpacityToScrollbars(float opacity) {
   for (ScrollbarLayerImplBase* scrollbar : Scrollbars()) {
     if (!scrollbar->is_overlay_scrollbar())
       continue;
     float effective_opacity = scrollbar->CanScrollOrientation() ? opacity : 0;
     PropertyTrees* property_trees =
         scrollbar->layer_tree_impl()->property_trees();
     // If this method is called during LayerImpl::PushPropertiesTo, we may not
-    // yet have valid layer_id_to_effect_node_index entries as property trees
-    // are pushed after layers during activation. We can skip updating opacity
-    // in that case as we are only registering a scrollbar and because opacity
-    // will be overwritten anyway when property trees are pushed.
-    if (property_trees->IsInIdToIndexMap(PropertyTrees::TreeType::EFFECT,
-                                         scrollbar->id())) {
+    // yet have valid layer_id_to_node_index entries in effect tree as property

[pdr., 2017/03/16 22:17:41]

Nit layer_id_to_node_index -> owning_layer_id_to_node_index

+    // trees are pushed after layers during activation. We can skip updating
+    // opacity in that case as we are only registering a scrollbar and because
+    // opacity will be overwritten anyway when property trees are pushed.
+    if (property_trees->effect_tree.FindNodeIndexFromOwningLayerId(
+            scrollbar->id()) != EffectTree::kInvalidNodeId) {
       property_trees->effect_tree.OnOpacityAnimated(
           effective_opacity,
-          property_trees->layer_id_to_effect_node_index[scrollbar->id()],
+          property_trees->effect_tree.FindNodeIndexFromOwningLayerId(
+              scrollbar->id()),
           scrollbar->layer_tree_impl());
     }
   }
 
   bool previouslyVisible = opacity_ > 0.0f;
   bool currentlyVisible = opacity > 0.0f;
 
   opacity_ = opacity;
 
   if (previouslyVisible != currentlyVisible)
     client_->DidChangeScrollbarVisibility();
 }
 
 }  // namespace cc