Introduce authentication service.

services/authentication/BUILD.gn

+# Copyright 2015 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/tools/bindings/mojom.gni")
+
+if (is_android) {
+  import("//services/android/rules.gni")
+  import("//build/config/android/config.gni")
+
+  mojo_android_java_application("authentication") {
+    sources = [
+      "src/org/chromium/mojo/authentication/Authentication.java",
+      "src/org/chromium/mojo/authentication/AuthenticationServiceImpl.java",
+    ]
+
+    mojo_main = "org.chromium.mojo.authentication.Authentication"
+
+    deps = [
+      ":bindings_java",
+      "//mojo/public/interfaces/application:application_java",
+      "//mojo/public/java:application",
+      "//services/android:bindings_java",
+      "//third_party/android_tools:google_play_services_default_java",
+    ]
+  }
+}
+
+mojom("bindings") {
+  sources = [
+    "authentication.mojom",
+  ]
+}