Adding client code for new Windows 10 First Run Experience

chrome/browser/resources/welcome/win10/welcome-win10.js

+// Copyright 2016 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.
+
+cr.define('welcomewin10', function() {
+  'use strict';
+
+  function onContinue(e) {
+    chrome.send('handleContinue');
+  }
+
+  function initialize() {
+    $('continue-button').addEventListener('click', onContinue);
+  }
+
+  return {
+    initialize: initialize
+  };
+});
+
+document.addEventListener('DOMContentLoaded', welcomewin10.initialize);