Use element id's for animations

cc/test/layer_test_common.h

 // 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.
 
 #ifndef CC_TEST_LAYER_TEST_COMMON_H_
 #define CC_TEST_LAYER_TEST_COMMON_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 139 matching lines @@
     }
     FakeLayerTreeHost* host() { return host_.get(); }
     FakeLayerTreeHostImpl* host_impl() const { return host_->host_impl(); }
     TaskRunnerProvider* task_runner_provider() const {
       return host_->host_impl()->task_runner_provider();
     }
     const QuadList& quad_list() const { return render_pass_->quad_list; }
     scoped_refptr<AnimationTimeline> timeline() { return timeline_; }
     scoped_refptr<AnimationTimeline> timeline_impl() { return timeline_impl_; }
 
+    void SetElementIdsForTesting() {
+      host_impl()->active_tree()->SetElementIdsForTesting();
+    }
+
    private:
     FakeLayerTreeHostClient client_;
     TestTaskGraphRunner task_graph_runner_;
     std::unique_ptr<OutputSurface> output_surface_;
     std::unique_ptr<FakeLayerTreeHost> host_;
     std::unique_ptr<RenderPass> render_pass_;
     scoped_refptr<AnimationTimeline> timeline_;
     scoped_refptr<AnimationTimeline> timeline_impl_;
     int layer_impl_id_;
   };
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_LAYER_TEST_COMMON_H_