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

cc/trees/mutator_host_client.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_TREES_MUTATOR_HOST_CLIENT_H_
 #define CC_TREES_MUTATOR_HOST_CLIENT_H_
 
+// TODO(loyso) Move these headers out of cc/animation.
 #include "cc/animation/element_id.h"
+#include "cc/animation/property_animation_state.h"
+#include "cc/animation/target_property.h"
 
 namespace gfx {
 class Transform;
 class ScrollOffset;
 }
 
 namespace cc {
 
 class FilterOperations;
 
@@ skipping 16 matching lines @@
                                         ElementListType list_type,
                                         float opacity) = 0;
   virtual void SetElementTransformMutated(ElementId element_id,
                                           ElementListType list_type,
                                           const gfx::Transform& transform) = 0;
   virtual void SetElementScrollOffsetMutated(
       ElementId element_id,
       ElementListType list_type,
       const gfx::ScrollOffset& scroll_offset) = 0;
 
-  virtual void ElementTransformIsAnimatingChanged(
+  // Allows to change IsAnimating value for a set of properties.
+  virtual void ElementIsAnimatingChanged(
       ElementId element_id,
       ElementListType list_type,
-      AnimationChangeType change_type,
-      bool is_animating) = 0;
-
-  virtual void ElementOpacityIsAnimatingChanged(ElementId element_id,
-                                                ElementListType list_type,
-                                                AnimationChangeType change_type,
-                                                bool is_animating) = 0;
-
-  virtual void ElementFilterIsAnimatingChanged(ElementId element_id,
-                                               ElementListType list_type,
-                                               AnimationChangeType change_type,
-                                               bool is_animating) = 0;
+      const PropertyAnimationState& mask,
+      const PropertyAnimationState& state) = 0;
 
   virtual void ScrollOffsetAnimationFinished() = 0;
   virtual gfx::ScrollOffset GetScrollOffsetForAnimation(
       ElementId element_id) const = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_MUTATOR_HOST_CLIENT_H_