[AppRemoting] Implements LicenseManager.

remoting/webapp/app_remoting/js/gaia_license_manager.js

+// 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.
+
+/** @suppress {duplicate} */
+var remoting = remoting || {};
+
+(function() {
+
+"use strict";
+
+/**
+ * A simple implementation of AppRemotingAuth using the user's GAIA token.
+ *
+ * @implements{remoting.LicenseManager}
+ * @constructor
+ */
+remoting.GaiaLicenseManager = function() {};
+
+/**
+ * @param {string} oauthToken
+ * @return {Promise<!string>}
+ */
+remoting.GaiaLicenseManager.prototype.getSubscriptionToken =
+    function(oauthToken) {
+  return Promise.resolve(oauthToken);
+};
+
+/**
+ * @param {string} oauthToken
+ * @return {Promise<!string>}
+ */
+remoting.GaiaLicenseManager.prototype.getAccessToken = function(oauthToken) {
+  return Promise.resolve("");
+};
+
+})();
+