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

ui/app_list/views/apps_container_view.h

 // 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.
 
 #ifndef UI_APP_LIST_VIEWS_APPS_CONTAINER_VIEW_H_
 #define UI_APP_LIST_VIEWS_APPS_CONTAINER_VIEW_H_
 
+#include "ui/app_list/app_list_export.h"
 #include "ui/app_list/app_list_folder_item.h"
 #include "ui/app_list/views/top_icon_animation_view.h"
 #include "ui/views/view.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace app_list {
 
 class AppsGridView;
 class ApplicationDragAndDropHost;
 class AppListFolderItem;
 class AppListFolderView;
 class AppListMainView;
 class AppListModel;
 class ContentsView;
 class FolderBackgroundView;
 class PaginationModel;
 
 // AppsContainerView contains a root level AppsGridView to render the root level
 // app items, and a AppListFolderView to render the app items inside the
 // active folder. Only one if them is visible to user at any time.
-class AppsContainerView : public views::View,
-                          public TopIconAnimationObserver {
+class APP_LIST_EXPORT AppsContainerView : public views::View,
+                                          public TopIconAnimationObserver {
  public:
   AppsContainerView(AppListMainView* app_list_main_view,
                     PaginationModel* pagination_model,
                     AppListModel* model);
   virtual ~AppsContainerView();
 
   // Shows the active folder content specified by |folder_item|.
   void ShowActiveFolder(AppListFolderItem* folder_item);
 
   // Shows the root level apps list. This is called when UI navigate back from
@@ skipping 57 matching lines @@
 
   size_t top_icon_animation_pending_count_;
 
   DISALLOW_COPY_AND_ASSIGN(AppsContainerView);
 };
 
 }  // namespace app_list
 
 
 #endif  // UI_APP_LIST_VIEWS_APPS_CONTAINER_VIEW_H_