Automate host start up in browser test

remoting/webapp/browser_test/update_pin_browser_test.js

 // Copyright 2014 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
  * @suppress {checkTypes}
  * Browser test for the scenario below:
  * 1. Change the PIN.
  * 2. Connect with the new PIN.
@@ skipping 35 matching lines @@
     this.changePIN_.bind(this, data.old_pin)
   ).then(
     // On fulfilled.
     browserTest.pass,
     // On rejected.
     browserTest.fail
   );
 };
 
 browserTest.Update_PIN.prototype.changePIN_ = function(newPin) {
-  var AppMode = remoting.AppMode;
-  var HOST_RESTART_WAIT = 10000;
-
   browserTest.clickOnControl('change-daemon-pin');
-
-  return browserTest.onUIMode(AppMode.HOST_SETUP_ASK_PIN).then(function() {
-    var onSetupDone = browserTest.onUIMode(AppMode.HOST_SETUP_DONE);
-    document.getElementById('daemon-pin-entry').value = newPin;
-    document.getElementById('daemon-pin-confirm').value = newPin;
-    browserTest.clickOnControl('daemon-pin-ok');
-    return onSetupDone;
-  }).then(function() {
-    browserTest.clickOnControl('host-config-done-dismiss');
-    // On Linux, we restart the host after changing the PIN, need to sleep
-    // for ten seconds before the host is ready for connection.
-    return base.Promise.sleep(HOST_RESTART_WAIT);
-  });
+  return browserTest.setupPIN(newPin);
 };
 
 browserTest.Update_PIN.prototype.disconnect_ = function() {
   var AppMode = remoting.AppMode;
 
   remoting.disconnect();
 
   return browserTest.onUIMode(AppMode.CLIENT_SESSION_FINISHED_ME2ME)
   .then(function() {
     var onHome = browserTest.onUIMode(AppMode.HOME);
@@ skipping 12 matching lines @@
   return base.Promise.sleep(CONNECT_PIN_WAIT).then(function() {
     browserTest.clickOnControl('pin-connect-button');
   }).then(function() {
     if (expectError) {
       return browserTest.expectMe2MeError(remoting.Error.INVALID_ACCESS_CODE);
     } else {
       return browserTest.expectMe2MeConnected();
     }
   });
 };