Display dialog when app install succeeds / fails on Athena

extensions/browser/BUILD.gn

 # 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 
 # GYP version: extensions/extensions.gyp:extensions_browser
 source_set("browser") {
   sources = [
@@ skipping 377 matching lines @@
       "guest_view/web_view/web_view_renderer_state.cc",
       "guest_view/web_view/web_view_renderer_state.h",
       "image_loader.cc",
       "image_loader.h",
       "image_loader_factory.cc",
       "image_loader_factory.h",
       "image_util.cc",
       "image_util.h",
       "info_map.cc",
       "info_map.h",
+      "install/crx_installer_error.h",
+      "install/extension_install_ui.cc",
+      "install/extension_install_ui.h",
       "install_flag.h",
       "lazy_background_task_queue.cc",
       "lazy_background_task_queue.h",
       "management_policy.cc",
       "management_policy.h",
       "pref_names.cc",
       "pref_names.h",
       "process_manager.cc",
       "process_manager.h",
       "process_manager_delegate.h",
@@ skipping 77 matching lines @@
       ]
     }
   }
 
   if (is_win) {
     cflags = [
       "/wd4267", # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     ]
   }
 }