Implement app list folder management page UI.

ash/test/app_list_controller_test_api.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 ASH_TEST_APP_LIST_CONTROLLER_TEST_API_H_
 #define ASH_TEST_APP_LIST_CONTROLLER_TEST_API_H_
 
 #include "base/basictypes.h"
 
 namespace app_list {
 class AppListView;
+class AppsGridView;
 }
 
 namespace ash {
 class Shell;
 namespace internal {
 class AppListController;
 }
 
 namespace test {
 
 // Accesses private data from an AppListController for testing.
 class AppListControllerTestApi {
  public:
   explicit AppListControllerTestApi(Shell* shell);
 
+  // Gets the root level apps grid view.
+  app_list::AppsGridView* GetRootGridView();
+
   app_list::AppListView* view();
 
  private:
   internal::AppListController* app_list_controller_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(AppListControllerTestApi);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_APP_LIST_CONTROLLER_TEST_API_H_