Display dialog when app install succeeds / fails on Athena

extensions/extensions.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 660 matching lines @@
         'browser/guest_view/web_view/web_view_renderer_state.cc',
         'browser/guest_view/web_view/web_view_renderer_state.h',
         'browser/image_loader.cc',
         'browser/image_loader.h',
         'browser/image_loader_factory.cc',
         'browser/image_loader_factory.h',
         'browser/image_util.cc',
         'browser/image_util.h',
         'browser/info_map.cc',
         'browser/info_map.h',
+        'browser/install/crx_installer_error.h',
+        'browser/install/extension_install_ui.cc',
+        'browser/install/extension_install_ui.h',
         'browser/install_flag.h',
         'browser/file_highlighter.cc',
         'browser/file_highlighter.h',
         'browser/file_reader.cc',
         'browser/file_reader.h',
         'browser/lazy_background_task_queue.cc',
         'browser/lazy_background_task_queue.h',
         'browser/management_policy.cc',
         'browser/management_policy.h',
         'browser/notification_types.h',
@@ skipping 509 matching lines @@
       'conditions': [
         ['OS=="win" and win_use_allocator_shim==1', {
           'dependencies': [
             '../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
     },
   ]
 }