CC Animation: Use ElementId to attach CC animation players.

cc/test/layer_tree_test.cc

 // Copyright 2011 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_tree_test.h"
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 718 matching lines @@
   // so that those tasks will happen before the first commit.
   if (layer_tree_host_) {
     static_cast<LayerTreeHostForTesting*>(layer_tree_host_.get())
         ->set_test_started(true);
   }
 }
 
 void LayerTreeTest::SetupTree() {
   if (!layer_tree_host_->root_layer()) {
     scoped_refptr<Layer> root_layer = Layer::Create();
+    root_layer->SetElementId(NextTestElementId());
     root_layer->SetBounds(gfx::Size(1, 1));
     layer_tree_host_->SetRootLayer(root_layer);
   }
 
   gfx::Size root_bounds = layer_tree_host_->root_layer()->bounds();
   gfx::Size device_root_bounds = gfx::ScaleToCeiledSize(
       root_bounds, layer_tree_host_->device_scale_factor());
   layer_tree_host_->SetViewportSize(device_root_bounds);
   layer_tree_host_->root_layer()->SetIsDrawable(true);
 }
 
 void LayerTreeTest::Timeout() {
   timed_out_ = true;
   EndTest();
 }
 
+scoped_refptr<Layer> LayerTreeTest::CreateTestLayer() {
+  auto layer = Layer::Create();
+  layer->SetElementId(NextTestElementId());
+  return layer;
+}
+
 void LayerTreeTest::RealEndTest() {
   // TODO(mithro): Make this method only end when not inside an impl frame.
   bool main_frame_will_happen;
   if (IsRemoteTest()) {
     main_frame_will_happen =
         remote_client_layer_tree_host_
             ? remote_client_proxy()->MainFrameWillHappenForTesting()
             : false;
   } else {
     main_frame_will_happen =
@@ skipping 263 matching lines @@
 
 RemoteChannelImplForTest* LayerTreeTest::GetRemoteChannelImplForTest() const {
   DCHECK(IsRemoteTest());
   DCHECK(remote_client_layer_tree_host_);
 
   return static_cast<RemoteChannelImplForTest*>(
       remote_client_layer_tree_host_->proxy());
 }
 
 }  // namespace cc