CC Animation: Use ElementId to attach CC animation players.

cc/test/layer_test_common.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/test/layer_test_common.h"
 
 #include <stddef.h>
 
 #include "cc/animation/animation_host.h"
 #include "cc/animation/animation_id_provider.h"
@@ skipping 109 matching lines @@
     : LayerImplTest(LayerTreeSettings()) {}
 
 LayerTestCommon::LayerImplTest::LayerImplTest(const LayerTreeSettings& settings)
     : client_(FakeLayerTreeHostClient::DIRECT_3D),
       output_surface_(FakeOutputSurface::Create3d()),
       host_(FakeLayerTreeHost::Create(&client_, &task_graph_runner_, settings)),
       render_pass_(RenderPass::Create()),
       layer_impl_id_(2) {
   std::unique_ptr<LayerImpl> root =
       LayerImpl::Create(host_->host_impl()->active_tree(), 1);
+  root->SetElementId(NextElementId());
   host_->host_impl()->active_tree()->SetRootLayer(std::move(root));
   root_layer()->SetHasRenderSurface(true);
   host_->host_impl()->SetVisible(true);
   host_->host_impl()->InitializeRenderer(output_surface_.get());
 
   const int timeline_id = AnimationIdProvider::NextTimelineId();
   timeline_ = AnimationTimeline::Create(timeline_id);
   host_->animation_host()->AddAnimationTimeline(timeline_);
   // Create impl-side instance.
   host_->animation_host()->PushPropertiesTo(
@@ skipping 68 matching lines @@
 void EmptyCopyOutputCallback(std::unique_ptr<CopyOutputResult> result) {}
 
 void LayerTestCommon::LayerImplTest::RequestCopyOfOutput() {
   std::vector<std::unique_ptr<CopyOutputRequest>> copy_requests;
   copy_requests.push_back(
       CopyOutputRequest::CreateRequest(base::Bind(&EmptyCopyOutputCallback)));
   root_layer()->PassCopyRequests(&copy_requests);
 }
 
 }  // namespace cc