Added (incomplete) implementation of HostListApi using GCD.

remoting/webapp/crd/js/host_controller_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
  * Unit tests for host_controller.js.
  */
 
 (function() {
@@ skipping 64 matching lines @@
 var mockHostListApi;
 
 QUnit.module('host_controller', {
   beforeEach: function(/** QUnit.Assert */ assert) {
     chromeMocks.activate(['identity', 'runtime']);
     chromeMocks.identity.mock$setToken(FAKE_IDENTITY_TOKEN);
     remoting.settings = new remoting.Settings();
     remoting.identity = new remoting.Identity();
     mockHostListApi = new remoting.MockHostListApi;
     mockHostListApi.registerResult = FAKE_AUTH_CODE;
-    remoting.hostListApi = mockHostListApi;
+    remoting.HostListApi.setInstance(mockHostListApi);
     base.debug.assert(remoting.oauth2 === null);
     remoting.oauth2 = new remoting.OAuth2();
     base.debug.assert(remoting.hostList === null);
     remoting.hostList = /** @type {remoting.HostList} */
         (Object.create(remoting.HostList.prototype));
 
     // When the HostList's unregisterHostById method is called, make
     // sure the argument is correct.
     unregisterHostByIdSpy =
         sinon.stub(remoting.hostList, 'unregisterHostById', function(
@@ skipping 70 matching lines @@
 
   afterEach: function() {
     controller = null;
     getCredentialsFromAuthCodeSpy.restore();
     generateUuidStub.restore();
     hostDaemonFacadeCtorStub.restore();
     signalStrategyCreateStub.restore();
     remoting.hostList = null;
     remoting.oauth2 = null;
     chromeMocks.restore();
-    remoting.hostListApi = null;
+    remoting.HostListApi.setInstance(null);
     remoting.identity = null;
   }
 });
 
 /**
  * @param {string} hostId
  * @param {string} pin
  * @return {string}
  */
 function fakePinHashFunc(hostId, pin) {
@@ skipping 450 matching lines @@
       resolve(null);
     });
   });
 });
 
 // Tests omitted for hasFeature, getPairedClients, deletePairedClient,
 // and clearPairedClients because they simply call through to
 // HostDaemonFacade.
 
 })();