Skeleton for app_list on OSX, and refactoring for enable_app_list=1 on OS=="mac".

ui/app_list/views/page_switcher.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 UI_APP_LIST_PAGE_SWITCHER_H_
-#define UI_APP_LIST_PAGE_SWITCHER_H_
+#ifndef UI_APP_LIST_VIEWS_PAGE_SWITCHER_H_
+#define UI_APP_LIST_VIEWS_PAGE_SWITCHER_H_
 
 #include "base/basictypes.h"
 #include "ui/app_list/pagination_model_observer.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/view.h"
 
 namespace app_list {
 
 class PaginationModel;
 
@@ skipping 33 matching lines @@
   virtual void TransitionChanged() OVERRIDE;
 
   PaginationModel* model_;  // Owned by parent AppListView.
   views::View* buttons_;  // Owned by views hierarchy.
 
   DISALLOW_COPY_AND_ASSIGN(PageSwitcher);
 };
 
 }  // namespace app_list
 
-#endif  // UI_APP_LIST_PAGE_SWITCHER_H_
+#endif  // UI_APP_LIST_VIEWS_PAGE_SWITCHER_H_