Change cc::ElementId to be a uint64_t

ui/compositor/layer_animator.cc

 // Copyright (c) 2012 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 "ui/compositor/layer_animator.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 148 matching lines @@
 
   cc::AnimationTimeline* timeline = compositor->GetAnimationTimeline();
   DCHECK(timeline);
 
   DetachLayerFromAnimationPlayer();
   timeline->DetachPlayer(animation_player_);
 }
 
 void LayerAnimator::AttachLayerToAnimationPlayer(int layer_id) {
   // For ui, layer and element ids are equivalent.
-  cc::ElementId element_id(layer_id, 0);
+  cc::ElementId element_id(layer_id);
   if (!animation_player_->element_id())
     animation_player_->AttachElement(element_id);
   else
     DCHECK_EQ(animation_player_->element_id(), element_id);
 
   animation_player_->set_animation_delegate(this);
 }
 
 void LayerAnimator::DetachLayerFromAnimationPlayer() {
   animation_player_->set_animation_delegate(nullptr);
@@ skipping 755 matching lines @@
     const base::WeakPtr<LayerAnimationSequence>& sequence)
     : sequence_(sequence) {
 }
 
 LayerAnimator::RunningAnimation::RunningAnimation(
     const RunningAnimation& other) = default;
 
 LayerAnimator::RunningAnimation::~RunningAnimation() { }
 
 }  // namespace ui