Creates BackgroundShell and uses it in test

mojo/shell/standalone/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("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
@@ skipping 36 matching lines @@
   } else {
     sources += [
       "android/context_init.h",
       "android/library_loader.cc",
       "android/main.cc",
       "android/main.h",
     ]
 
     deps += [
       ":jni_headers",
+      "//base:i18n",
       "//components/mus",
       "//components/mus/ws:lib",
       "//mojo/shell",
       "//ui/gl",
       "//ui/platform_window/android",
     ]
   }
 }
 
 executable("standalone") {
@@ skipping 231 matching lines @@
       ":copy_mojo_shell_standalone",
       ":java",
       ":mojo_shell_standalone_apptests_assets",
       ":resources",
       "//base:base_java",
       "//ui/platform_window/android:platform_window_java",
       google_play_services_resources,
     ]
   }
 }