cc: Move filters to the effect tree

cc/animation/element_animations.h

 // Copyright 2015 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_ANIMATION_ELEMENT_ANIMATIONS_H_
 #define CC_ANIMATION_ELEMENT_ANIMATIONS_H_
 
 #include <bitset>
 #include <memory>
 #include <vector>
@@ skipping 276 matching lines @@
     bool potentially_animating_for_active_elements = false;
     bool potentially_animating_for_pending_elements = false;
     void Clear() {
       currently_running_for_active_elements = false;
       currently_running_for_pending_elements = false;
       potentially_animating_for_active_elements = false;
       potentially_animating_for_pending_elements = false;
     }
   };
 
+  struct PropertyAnimationState filter_animation_state_;
   struct PropertyAnimationState opacity_animation_state_;
   struct PropertyAnimationState transform_animation_state_;
 
   DISALLOW_COPY_AND_ASSIGN(ElementAnimations);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_ELEMENT_ANIMATIONS_H_