Change cc::ElementId to be a uint64_t

cc/test/animation_timelines_test_common.cc

 // Copyright 2015 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/test/animation_timelines_test_common.h"
 
 #include "base/memory/ptr_util.h"
 #include "cc/animation/animation_events.h"
 #include "cc/animation/animation_id_provider.h"
 #include "cc/animation/animation_player.h"
@@ skipping 337 matching lines @@
     : client_(ThreadInstance::MAIN),
       client_impl_(ThreadInstance::IMPL),
       host_(nullptr),
       host_impl_(nullptr),
       timeline_id_(AnimationIdProvider::NextTimelineId()),
       player_id_(AnimationIdProvider::NextPlayerId()),
       next_test_layer_id_(0) {
   host_ = client_.host();
   host_impl_ = client_impl_.host();
 
-  element_id_ = ElementId(NextTestLayerId(), 0);
+  element_id_ = ElementId(NextTestLayerId());
 }
 
 AnimationTimelinesTest::~AnimationTimelinesTest() {
 }
 
 void AnimationTimelinesTest::SetUp() {
   timeline_ = AnimationTimeline::Create(timeline_id_);
   player_ = AnimationPlayer::Create(player_id_);
 }
 
@@ skipping 119 matching lines @@
   }
 
   return result;
 }
 
 void AnimationTimelinesTest::PushProperties() {
   host_->PushPropertiesTo(host_impl_);
 }
 
 }  // namespace cc