CC Animation: Use std::bitset to update animation state.

cc/trees/layer_tree.h

 // Copyright 2016 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_H_
 #define CC_TREES_LAYER_TREE_H_
 
 #include <memory>
 #include <unordered_map>
 #include <unordered_set>
@@ skipping 209 matching lines @@
   void SetElementOpacityMutated(ElementId element_id,
                                 ElementListType list_type,
                                 float opacity) override;
   void SetElementTransformMutated(ElementId element_id,
                                   ElementListType list_type,
                                   const gfx::Transform& transform) override;
   void SetElementScrollOffsetMutated(
       ElementId element_id,
       ElementListType list_type,
       const gfx::ScrollOffset& scroll_offset) override;
-  void ElementTransformIsAnimatingChanged(ElementId element_id,
-                                          ElementListType list_type,
-                                          AnimationChangeType change_type,
-                                          bool is_animating) override;
-  void ElementOpacityIsAnimatingChanged(ElementId element_id,
-                                        ElementListType list_type,
-                                        AnimationChangeType change_type,
-                                        bool is_animating) override;
-  void ElementFilterIsAnimatingChanged(ElementId element_id,
-                                       ElementListType list_type,
-                                       AnimationChangeType change_type,
-                                       bool is_animating) override;
+
+  void ElementIsAnimatingChanged(ElementId element_id,
+                                 ElementListType list_type,
+                                 const PropertyAnimationState& mask,
+                                 const PropertyAnimationState& state) override;
+
   void ScrollOffsetAnimationFinished() override {}
   gfx::ScrollOffset GetScrollOffsetForAnimation(
       ElementId element_id) const override;
 
   // Encapsulates the data, callbacks, interfaces received from the embedder.
   struct Inputs {
     Inputs();
     ~Inputs();
 
     scoped_refptr<Layer> root_layer;
@@ skipping 59 matching lines @@
   // external embedder.
   EnginePictureCache* engine_picture_cache_;
   ClientPictureCache* client_picture_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTree);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_H_