Adds DisplayErrorDialog to show the error message of the failure of mirroring to the users.

ash/ash.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
   'includes': [
@@ skipping 56 matching lines @@
         'desktop_background/desktop_background_controller.cc',
         'desktop_background/desktop_background_controller.h',
         'desktop_background/desktop_background_resources.cc',
         'desktop_background/desktop_background_resources.h',
         'desktop_background/desktop_background_view.cc',
         'desktop_background/desktop_background_view.h',
         'desktop_background/desktop_background_widget_controller.cc',
         'desktop_background/desktop_background_widget_controller.h',
         'display/display_controller.cc',
         'display/display_controller.h',
+        'display/display_error_dialog.cc',
+        'display/display_error_dialog.h',
         'display/mouse_cursor_event_filter.cc',
         'display/mouse_cursor_event_filter.h',
         'display/multi_display_manager.cc',
         'display/multi_display_manager.h',
         'display/output_configurator_animation.cc',
         'display/output_configurator_animation.h',
         'display/screen_position_controller.cc',
         'display/screen_position_controller.h',
         'display/secondary_display_view.cc',
         'display/secondary_display_view.h',
@@ skipping 579 matching lines @@
             'shell/cocoa/app-Info.plist',
           ],
           'xcode_settings': {
             'INFOPLIST_FILE': 'shell/cocoa/app-Info.plist',
           },
         }],
       ],
     },
   ],
 }