Add app_list_demo, a standalone executable for testing the app list UI.

ui/app_list/views/app_list_view.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_VIEWS_APP_LIST_VIEW_H_
 #define UI_APP_LIST_VIEWS_APP_LIST_VIEW_H_
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
@@ skipping 98 matching lines @@
   // Set a callback to be called the next time any app list paints.
   void SetNextPaintCallback(const base::Closure& callback);
 
 #if defined(OS_WIN)
   HWND GetHWND() const;
 #endif
 
   AppListMainView* app_list_main_view() { return app_list_main_view_; }
 
  private:
-  friend class test::AppListViewTestApi;
+  friend class ::test::AppListViewTestApi;
 
   void InitAsBubbleInternal(gfx::NativeView parent,
                             PaginationModel* pagination_model,
                             views::BubbleBorder::Arrow arrow,
                             bool border_accepts_events,
                             const gfx::Vector2d& anchor_offset);
 
   // Overridden from views::BubbleDelegateView:
   virtual void OnBeforeBubbleWidgetInit(
       views::Widget::InitParams* params,
@@ skipping 38 matching lines @@
 
   // For UMA and testing. If non-null, triggered when the app list is painted.
   base::Closure next_paint_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_APP_LIST_VIEW_H_