Add a unit test for resetting the app list on a reshow.

ui/app_list/views/top_icon_animation_view.h

 // Copyright 2014 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_APP_LIST_VIEWS_TOP_ICON_ANIMATION_VIEW_H
 #define UI_APP_LIST_VIEWS_TOP_ICON_ANIMATION_VIEW_H
 
 #include "base/observer_list.h"
+#include "ui/app_list/app_list_export.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/views/view.h"
 
 namespace views {
 class ImageView;
 }
 
 namespace app_list {
 
 // Observer for top icon animation completion.
-class TopIconAnimationObserver {
+class APP_LIST_EXPORT TopIconAnimationObserver {
  public:
   // Called when top icon animation completes.
   virtual void OnTopIconAnimationsComplete() {}
 
  protected:
   TopIconAnimationObserver() {}
   virtual ~TopIconAnimationObserver() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TopIconAnimationObserver);
@@ skipping 38 matching lines @@
   bool open_folder_;
 
   ObserverList<TopIconAnimationObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(TopIconAnimationView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_TOP_ICON_ANIMATION_VIEW_H