Show online policy on CrOS EULA page

chrome/browser/resources/chromeos/login/oobe_screen_eula.js

 // Copyright (c) 2012 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 Oobe eula screen implementation.
  */
 
 cr.define('oobe', function() {
   /**
@@ skipping 35 matching lines @@
         // WebKit does not allow immediate focus return.
         window.setTimeout(function() {
           // TODO(ivankr): focus cycling.
           $('installation-settings-ok-button').focus();
         }, 0);
         event.preventDefault();
       });
     },
 
     /**
+     * Event handler that is invoked just before the screen is shown.
+     * @param {object} data Screen init payload.
+     */
+    onBeforeShow: function() {
+      $('eula').classList.add('eula-loading');
+      $('cros-eula-frame').onload = function() {
+        $('accept-button').disabled = false;
+        $('eula').classList.remove('eula-loading');
+      }
+      $('cros-eula-frame').src = 'chrome://terms';
+    },
+
+    /**
      * Header text of the screen.
      * @type {string}
      */
     get header() {
       return loadTimeData.getString('eulaScreenTitle');
     },
 
     /**
      * Buttons in oobe wizard's button strip.
      * @type {array} Array of Buttons.
      */
     get buttons() {
       var buttons = [];
 
       var backButton = this.ownerDocument.createElement('button');
       backButton.id = 'back-button';
       backButton.textContent = loadTimeData.getString('back');
       backButton.addEventListener('click', function(e) {
         chrome.send('eulaOnExit', [false, $('usage-stats').checked]);
         e.stopPropagation();
       });
       buttons.push(backButton);
 
       var acceptButton = this.ownerDocument.createElement('button');
       acceptButton.id = 'accept-button';
+      acceptButton.disabled = true;
+      acceptButton.classList.add('preserve-disabled-state');
       acceptButton.textContent = loadTimeData.getString('acceptAgreement');
       acceptButton.addEventListener('click', function(e) {
         $('eula').classList.add('loading');  // Mark EULA screen busy.
         chrome.send('eulaOnExit', [true, $('usage-stats').checked]);
         e.stopPropagation();
       });
       buttons.push(acceptButton);
 
       return buttons;
     },
@@ skipping 13 matching lines @@
         $('cros-eula-frame').src = $('cros-eula-frame').src;
       if ($('oem-eula-frame').src != '')
         $('oem-eula-frame').src = $('oem-eula-frame').src;
     }
   };
 
   return {
     EulaScreen: EulaScreen
   };
 });