Use a bitfield to store animatable properties.

ui/compositor/layer_animator.h

 // Copyright (c) 2012 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 UI_COMPOSITOR_LAYER_ANIMATOR_H_
 #define UI_COMPOSITOR_LAYER_ANIMATOR_H_
 
 #include <deque>
 #include <vector>
 
@@ skipping 120 matching lines @@
   // some of them start on the compositor thread (but there is no such guarantee
   // for the effective start time of subsequent elements). Obviously will not
   // work if they animate any common properties. The animator takes ownership
   // of the animation sequences.
   void ScheduleTogether(const std::vector<LayerAnimationSequence*>& animations);
 
   // Schedules a pause for length |duration| of all the specified properties.
   // End the list with -1.
   void SchedulePauseForProperties(
       base::TimeDelta duration,
-      LayerAnimationElement::AnimatableProperty property,
-      ...);
+      LayerAnimationElement::AnimatableProperties properties_to_pause);
 
   // Returns true if there is an animation in the queue (animations remain in
   // the queue until they complete, so this includes running animations).
   bool is_animating() const { return !animation_queue_.empty(); }
 
   // Returns true if there is an animation in the queue that animates the given
   // property (animations remain in the queue until they complete, so this
   // includes running animations).
   bool IsAnimatingProperty(
       LayerAnimationElement::AnimatableProperty property) const;
@@ skipping 194 matching lines @@
   // Observers are notified when layer animations end, are scheduled or are
   // aborted.
   ObserverList<LayerAnimationObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerAnimator);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_LAYER_ANIMATOR_H_