Revert of Use element id's for animations

cc/trees/layer_tree_host_impl.h

 // 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.
 
 #ifndef CC_TREES_LAYER_TREE_HOST_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <stddef.h>
 
 #include <bitset>
@@ skipping 229 matching lines @@
   virtual void CommitComplete();
   virtual void UpdateAnimationState(bool start_ready_animations);
   bool Mutate(base::TimeTicks monotonic_time);
   void ActivateAnimations();
   void Animate();
   void AnimatePendingTreeAfterCommit();
   void MainThreadHasStoppedFlinging();
   void DidAnimateScrollOffset();
   void SetViewportDamage(const gfx::Rect& damage_rect);
 
-  void SetTreeLayerFilterMutated(ElementId element_id,
+  void SetTreeLayerFilterMutated(int layer_id,
                                  LayerTreeImpl* tree,
                                  const FilterOperations& filters);
-  void SetTreeLayerOpacityMutated(ElementId element_id,
+  void SetTreeLayerOpacityMutated(int layer_id,
                                   LayerTreeImpl* tree,
                                   float opacity);
-  void SetTreeLayerTransformMutated(ElementId element_id,
+  void SetTreeLayerTransformMutated(int layer_id,
                                     LayerTreeImpl* tree,
                                     const gfx::Transform& transform);
-  void SetTreeLayerScrollOffsetMutated(ElementId element_id,
+  void SetTreeLayerScrollOffsetMutated(int layer_id,
                                        LayerTreeImpl* tree,
                                        const gfx::ScrollOffset& scroll_offset);
   bool AnimationsPreserveAxisAlignment(const LayerImpl* layer) const;
 
   // MutatorHostClient implementation.
   bool IsElementInList(ElementId element_id,
                        ElementListType list_type) const override;
   void SetMutatorsNeedCommit() override;
   void SetMutatorsNeedRebuildPropertyTrees() override;
   void SetElementFilterMutated(ElementId element_id,
@@ skipping 595 matching lines @@
       fixed_raster_scale_attempted_scale_change_history_;
   std::unique_ptr<PendingTreeDurationHistogramTimer>
       pending_tree_duration_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_