Introduce authentication service.

services/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/ui.gni")
 import("//mojo/public/mojo.gni")
 
 group("services") {
   deps = [
     "//services/clipboard",
@@ skipping 12 matching lines @@
     "//services/surfaces",
     "//services/test_service:bindings",
     "//services/tracing",
     "//services/view_manager",
     "//services/window_manager",
   ]
 
   if (is_android) {
     deps += [
       "//services/android:java_handler",
+      "//services/authentication",
       "//services/location",
       "//services/sensors",
     ]
   }
 
   if (is_linux) {
     deps += [ "//services/python" ]
   }
 }