CC Animation: Use ElementId to attach CC animation players.

cc/test/layer_tree_host_common_test.h

 // Copyright 2014 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_TREE_HOST_COMMON_TEST_H_
 #define CC_TEST_LAYER_TREE_HOST_COMMON_TEST_H_
 
 #include <algorithm>
 #include <memory>
 #include <vector>
@@ skipping 116 matching lines @@
   }
   bool UpdateLayerListImplContains(int id) const {
     return std::count_if(
                update_layer_list_impl_->begin(), update_layer_list_impl_->end(),
                [id](LayerImpl* layer) { return layer->id() == id; }) != 0;
   }
 
   const LayerList& update_layer_list() const { return update_layer_list_; }
   bool UpdateLayerListContains(int id) const;
 
+  scoped_refptr<Layer> CreateTestLayer();
+  std::unique_ptr<LayerImpl> CreateTestLayerImpl(LayerTreeImpl* tree_impl,
+                                                 int id);
+
  private:
   std::unique_ptr<std::vector<LayerImpl*>> render_surface_layer_list_impl_;
   LayerList update_layer_list_;
   std::unique_ptr<LayerImplList> update_layer_list_impl_;
 };
 
 class LayerTreeHostCommonTest : public LayerTreeHostCommonTestBase,
                                 public testing::Test {
  public:
   LayerTreeHostCommonTest();
   explicit LayerTreeHostCommonTest(const LayerTreeSettings& settings);
 
  protected:
   static void SetScrollOffsetDelta(LayerImpl* layer_impl,
                                    const gfx::Vector2dF& delta) {
     if (layer_impl->layer_tree_impl()
             ->property_trees()
             ->scroll_tree.SetScrollOffsetDeltaForTesting(layer_impl->id(),
                                                          delta))
       layer_impl->layer_tree_impl()->DidUpdateScrollOffset(
           layer_impl->id(), layer_impl->transform_tree_index());
   }
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_LAYER_TREE_HOST_COMMON_TEST_H_