V2 app support step2 : Use NativeAppWindow for Activity's window.

athena/athena.gyp

 # Copyright 2014 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 169 matching lines @@
         'extensions/chrome/athena_apps_client.cc',
         'extensions/chrome/athena_apps_client.h',
         'extensions/chrome/extensions_delegate_impl.cc',
       ],
     },
     {
       'target_name': 'athena_app_shell_lib',
       'type': 'static_library',
       'dependencies': [
         '../extensions/shell/app_shell.gyp:app_shell_lib',
+        '../skia/skia.gyp:skia',
       ],
       'sources': [
         'content/shell/content_activity_factory.cc',
         'content/shell/dialogs.cc',
         'content/shell/shell_app_activity.cc',
         'content/shell/shell_app_activity.h',
         'extensions/shell/extensions_delegate_impl.cc',
       ],
     },
     {
@@ skipping 60 matching lines @@
         'screen/screen_manager_unittest.cc',
         'test/athena_unittests.cc',
         'wm/split_view_controller_unittest.cc',
         'wm/window_list_provider_impl_unittest.cc',
         'wm/window_manager_unittest.cc',
       ],
     }
   ],
 }