Change cc::ElementId to be a uint64_t

cc/animation/element_animations.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/animation/element_animations.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "cc/animation/animation_delegate.h"
 #include "cc/animation/animation_events.h"
 #include "cc/animation/animation_host.h"
 #include "cc/animation/animation_player.h"
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/base/filter_operations.h"
 #include "cc/trees/mutator_host_client.h"
 #include "ui/gfx/geometry/box_f.h"
 
 namespace cc {
 
 scoped_refptr<ElementAnimations> ElementAnimations::Create() {
   return make_scoped_refptr(new ElementAnimations());
 }
 
 ElementAnimations::ElementAnimations()
     : animation_host_(),
-      element_id_(),
       has_element_in_active_list_(false),
       has_element_in_pending_list_(false),
       needs_push_properties_(false),
       needs_update_impl_client_state_(false) {}
 
 ElementAnimations::~ElementAnimations() {}
 
 void ElementAnimations::SetAnimationHost(AnimationHost* host) {
   animation_host_ = host;
 }
@@ skipping 447 matching lines @@
   if (animation_host()) {
     DCHECK(animation_host()->mutator_host_client());
     return animation_host()->mutator_host_client()->GetScrollOffsetForAnimation(
         element_id());
   }
 
   return gfx::ScrollOffset();
 }
 
 }  // namespace cc