ChromeOS MD-OOBE: "Back" button for EULA screen.

chrome/browser/resources/chromeos/login/oobe_eula.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.
 
 /**
  * @fileoverview Polymer element for displaying material design Terms Of Service
  * screen.
  */
 
 Polymer({
@@ skipping 58 matching lines @@
   /**
    * This is 'on-tap' event handler for 'Accept' button.
    */
   eulaAccepted_: function(event) {
     chrome.send('login.EulaScreen.userActed', ['accept-button']);
   },
 
   /**
    * On-change event handler for usageStats.
    *
-   * * @private
+   * @private
    */
   onUsageChanged_: function() {
     this.screen.onUsageStatsClicked_(this.$.usageStats.checked);
   },
 
   /**
    * On-tap event handler for installationSettings.
    *
-   * * @private
+   * @private
    */
   onInstallationSettingsClicked_: function() {
     chrome.send('eulaOnInstallationSettingsPopupOpened');
     $('popup-overlay').hidden = false;
     $('installation-settings-ok-button').focus();
   },
 
   /**
    * On-tap event handler for stats-help-link.
    *
-   * * @private
+   * @private
    */
   onUsageStatsHelpLinkClicked_: function() {
     chrome.send('eulaOnLearnMore');
   },
+
+  /**
+   * On-tap event handler for back button.
+   *
+   * @private
+   */
+  onEulaBackButtonPressed_: function() {
+    chrome.send('login.EulaScreen.userActed', ['back-button']);
+  },
 });