Use a bitfield to store animatable properties.

ash/shelf/app_list_button.cc

 // Copyright 2013 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.
 
 #include "ash/shelf/app_list_button.h"
 
 #include <vector>
 
 #include "ash/ash_constants.h"
 #include "ash/shelf/shelf_button_host.h"
@@ skipping 49 matching lines @@
 
   opacity_sequence->set_is_cyclic(true);
 
   for (size_t i = 0; i < arraysize(kAnimationOpacity); ++i) {
     opacity_sequence->AddElement(
         ui::LayerAnimationElement::CreateOpacityElement(
             kAnimationOpacity[i],
             base::TimeDelta::FromMilliseconds(kAnimationDurationInMs)));
   }
 
-  ui::LayerAnimationElement::AnimatableProperties opacity_properties;
-  opacity_properties.insert(ui::LayerAnimationElement::OPACITY);
   opacity_sequence->AddElement(
       ui::LayerAnimationElement::CreatePauseElement(
-          opacity_properties,
+          ui::LayerAnimationElement::OPACITY,
           base::TimeDelta::FromMilliseconds(kAnimationDurationInMs)));
 
   // LayerAnimator takes ownership of the sequences.
   layer()->GetAnimator()->ScheduleAnimation(opacity_sequence.release());
 }
 
 void AppListButton::StopLoadingAnimation() {
   layer()->GetAnimator()->StopAnimating();
 
   ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator());
@@ skipping 40 matching lines @@
   host_->MouseExitedButton(this);
 }
 
 void AppListButton::GetAccessibleState(ui::AccessibleViewState* state) {
   state->role = ui::AccessibilityTypes::ROLE_PUSHBUTTON;
   state->name = host_->GetAccessibleName(this);
 }
 
 }  // namespace internal
 }  // namespace ash