[Chromoting] Enable jscompile for webapp unittests.

remoting/webapp/unittests/dns_blackhole_checker_unittest.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.
 
+/**
+ * @fileoverview
+ * TODO(garykac): Create interface for SignalStrategy.
+ * @suppress {checkTypes|checkVars|reportUnknownTypes|visibility}
+ */
+
 (function() {
 
 'use strict';
 
+/** @type {(sinon.Spy|function(remoting.SignalStrategy.State))} */
 var onStateChange = null;
+
+/** @type {(sinon.Spy|function(Element):void)} */
 var onIncomingStanzaCallback = null;
+
+/** @type {remoting.DnsBlackholeChecker} */
 var checker = null;
+
+/** @type {remoting.MockSignalStrategy} */
 var signalStrategy = null;
 var fakeXhrs;
 
 module('dns_blackhole_checker', {
   setup: function() {
     fakeXhrs = [];
     sinon.useFakeXMLHttpRequest().onCreate = function(xhr) {
       fakeXhrs.push(xhr);
     };
 
-
     onStateChange = sinon.spy();
     onIncomingStanzaCallback = sinon.spy();
     signalStrategy = new remoting.MockSignalStrategy();
     checker = new remoting.DnsBlackholeChecker(signalStrategy);
 
     checker.setStateChangedCallback(onStateChange);
     checker.setIncomingStanzaCallback(onIncomingStanzaCallback);
 
     sinon.assert.notCalled(onStateChange);
     sinon.assert.notCalled(signalStrategy.connect);
@@ skipping 116 matching lines @@
     // Verify that DnsBlackholeChecker goes to FAILED state after it gets the
     // blocked HTTP response.
     fakeXhrs[0].respond(400);
     sinon.assert.calledWith(onStateChange,
                             remoting.SignalStrategy.State.FAILED);
     equal(checker.getError(), remoting.Error.NOT_AUTHORIZED);
   }
 );
 
 })();