Change cc::ElementId to be a uint64_t

cc/trees/layer_tree_host_unittest_animation.cc

 // Copyright 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 "cc/trees/layer_tree_host.h"
 
 #include <stdint.h>
 #include <climits>
 
 #include "cc/animation/animation_curve.h"
@@ skipping 472 matching lines @@
 class LayerTreeHostAnimationTestLayerAddedWithAnimation
     : public LayerTreeHostAnimationTest {
  public:
   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 
   void DidCommit() override {
     if (layer_tree_host()->SourceFrameNumber() == 1) {
       AttachPlayersToTimeline();
 
       scoped_refptr<Layer> layer = Layer::Create();
-      layer->SetElementId(ElementId(42, 0));
+      layer->SetElementId(42);
       player_->AttachElement(layer->element_id());
       player_->set_animation_delegate(this);
 
       // Any valid AnimationCurve will do here.
       std::unique_ptr<AnimationCurve> curve(new FakeFloatAnimationCurve());
       std::unique_ptr<Animation> animation(
           Animation::Create(std::move(curve), 1, 1, TargetProperty::OPACITY));
       player_->AddAnimation(std::move(animation));
 
       // We add the animation *before* attaching the layer to the tree.
@@ skipping 1463 matching lines @@
  private:
   scoped_refptr<Layer> layer_;
   FakeContentLayerClient client_;
 };
 
 MULTI_THREAD_TEST_F(
     LayerTreeHostAnimationTestRebuildPropertyTreesOnAnimationSetNeedsCommit);
 
 }  // namespace
 }  // namespace cc