cc: LayerTreeHostImpl uses element id to tick animations

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 b5a85d703cade5321313c783a2623eb91f183a20..4d41deb3034a7df0a2dc6073f49e4f2e441da45c 100644
--- a/cc/input/scrollbar_animation_controller.cc
+++ b/cc/input/scrollbar_animation_controller.cc
@@ -365,22 +365,7 @@ void ScrollbarAnimationController::ApplyOpacityToScrollbars(float opacity) {
     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 owning_layer_id_to_node_index entries in effect tree 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->effect_tree.FindNodeIndexFromOwningLayerId(
-            scrollbar->id()) != EffectTree::kInvalidNodeId) {
-      property_trees->effect_tree.OnOpacityAnimated(
-          effective_opacity,
-          property_trees->effect_tree.FindNodeIndexFromOwningLayerId(
-              scrollbar->id()),
-          scrollbar->layer_tree_impl());
-    }
+    scrollbar->SetOverlayScrollbarLayerOpacityAnimated(effective_opacity);
   }
 
   bool previouslyVisible = opacity_ > 0.0f;