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

cc/input/scrollbar_animation_controller.cc

Index: cc/input/scrollbar_animation_controller.cc
diff --git a/cc/input/scrollbar_animation_controller.cc b/cc/input/scrollbar_animation_controller.cc
index 4906ef4737db1921018b018ad1b8243652714805..b856937762e9ed1e77816839de51cdb32ef496da 100644
--- a/cc/input/scrollbar_animation_controller.cc
+++ b/cc/input/scrollbar_animation_controller.cc
@@ -346,15 +346,16 @@ void ScrollbarAnimationController::ApplyOpacityToScrollbars(float opacity) {
     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());
     }
   }