[Chromoting] Enable jscompile for webapp unittests.

remoting/webapp/unittests/mock_signal_strategy.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.
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 
 /**
- * @param {string} jid
- * @param {remoting.SignalStrategy.Type} type
+ * @param {string=} jid
+ * @param {remoting.SignalStrategy.Type=} type
  *
  * @implements {remoting.SignalStrategy}
  * @constructor
  */
 remoting.MockSignalStrategy = function(jid, type) {
   this.jid_ = (jid != undefined) ? jid : "jid@example.com";
   this.type_ = (type != undefined) ? type : remoting.SignalStrategy.Type.XMPP;
   this.onStateChangedCallback_ = null;
 
   /** @type {remoting.SignalStrategy.State} */
@@ skipping 46 matching lines @@
   return this.type_;
 };
 
 /**
  * @param {remoting.SignalStrategy.State} state
  */
 remoting.MockSignalStrategy.prototype.setStateForTesting = function(state) {
   this.state_ = state;
   this.onStateChangedCallback_(state);
 };