Implement app list folder management page UI.

ash/test/app_list_controller_test_api.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/test/app_list_controller_test_api.h"
 
 #include "ash/test/shell_test_api.h"
 #include "ash/wm/app_list_controller.h"
+#include "ui/app_list/views/app_list_main_view.h"
+#include "ui/app_list/views/app_list_view.h"
+#include "ui/app_list/views/apps_container_view.h"
+#include "ui/app_list/views/apps_grid_view.h"
+#include "ui/app_list/views/contents_view.h"
 
 namespace ash {
 namespace test {
 
 AppListControllerTestApi::AppListControllerTestApi(Shell* shell)
     : app_list_controller_(ShellTestApi(shell).app_list_controller()) {}
 
+app_list::AppsGridView* AppListControllerTestApi::GetRootGridView() {
+  return view()->app_list_main_view()->contents_view()->
+      apps_container_view()->apps_grid_view();
+}
+
 app_list::AppListView* AppListControllerTestApi::view() {
   return app_list_controller_->view_;
 }
 
 }  // namespace test
 }  // namespace ash