cc : Track transform animation changes on transform tree

cc/trees/property_tree.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_TREES_PROPERTY_TREE_H_
 #define CC_TREES_PROPERTY_TREE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 105 matching lines @@
   int sorting_context_id;
 
   // TODO(vollick): will be moved when accelerated effects are implemented.
   bool needs_local_transform_update : 1;
 
   bool node_and_ancestors_are_animated_or_invertible : 1;
 
   bool is_invertible : 1;
   bool ancestors_are_invertible : 1;
 
-  bool is_animated : 1;
+  bool has_potential_animation : 1;
+  bool is_currently_animating : 1;
   bool to_screen_is_potentially_animated : 1;
   bool has_only_translation_animations : 1;
   bool to_screen_has_scale_animation : 1;
 
   // Flattening, when needed, is only applied to a node's inherited transform,
   // never to its local transform.
   bool flattens_inherited_transform : 1;
 
   // This is true if the to_parent transform at every node on the path to the
   // root is flat.
@@ skipping 583 matching lines @@
 
  private:
   gfx::Vector2dF inner_viewport_container_bounds_delta_;
   gfx::Vector2dF outer_viewport_container_bounds_delta_;
   gfx::Vector2dF inner_viewport_scroll_bounds_delta_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROPERTY_TREE_H_