Implemented event-dispatching for button clicks.

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.
  */
 
 login.createScreen('EulaScreen', 'eula', function() {
   var CONTEXT_KEY_USAGE_STATS_ENABLED = 'usageStatsEnabled';
@@ skipping 68 matching lines @@
       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';
+      var backButton = this.declareButton('back-button');
       backButton.textContent = loadTimeData.getString('back');
-
-      var self = this;
-      backButton.addEventListener('click', function(e) {
-        chrome.send('eulaBackButtonClicked');
-        e.stopPropagation();
-      });
       buttons.push(backButton);
 
-      var acceptButton = this.ownerDocument.createElement('button');
-      acceptButton.id = 'accept-button';
+      var acceptButton = this.declareButton('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('eulaAcceptButtonClicked');
         e.stopPropagation();
       });
       buttons.push(acceptButton);
 
       return buttons;
     },
 
     /**
      * Returns a control which should receive an initial focus.
      */
@@ skipping 24 matching lines @@
       if ($('cros-eula-frame').src) {
         $('cros-eula-frame').src = $('cros-eula-frame').src;
       }
       if ($('oem-eula-frame').src) {
         $('oem-eula-frame').src = $('oem-eula-frame').src;
       }
     }
   };
 });