Reland 152221 - chromeos: Sync animation.

ash/launcher/launcher_model_observer.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 ASH_LAUNCHER_LAUNCHER_MODEL_OBSERVER_H_
 #define ASH_LAUNCHER_LAUNCHER_MODEL_OBSERVER_H_
 
 #include "ash/ash_export.h"
 #include "ash/launcher/launcher_types.h"
 
 namespace ash {
 
 struct LauncherItem;
 
 class ASH_EXPORT LauncherModelObserver {
  public:
   // Invoked after an item has been added to the model.
   virtual void LauncherItemAdded(int index) = 0;
 
   // Invoked after an item has been removed. |index| is the index the item was
   // at.
   virtual void LauncherItemRemoved(int index, LauncherID id) = 0;
 
   // Invoked after an item has been moved. See LauncherModel::Move() for details
   // of the arguments.
   virtual void LauncherItemMoved(int start_index, int target_index) = 0;
 
-  // Invoked when the the state of an item changes. |old_item| is the item
+  // Invoked when the state of an item changes. |old_item| is the item
   // before the change.
   virtual void LauncherItemChanged(int index, const LauncherItem& old_item) = 0;
 
+  // Invoked when launcher status is changed.
+  virtual void LauncherStatusChanged() = 0;
+
  protected:
   virtual ~LauncherModelObserver() {}
 };
 
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_MODEL_OBSERVER_H_