Add tabs to passwords and exceptions subpage

chrome/browser/resources/options/options_page.js

 // Copyright (c) 2010 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('options', function() {
   /////////////////////////////////////////////////////////////////////////////
   // OptionsPage class:
 
   /**
    * Base class for options page.
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   };
 
   OptionsPage.clearOverlays = function() {
      for (var name in OptionsPage.registeredOverlayPages_) {
        var page = OptionsPage.registeredOverlayPages_[name];
        page.visible = false;
      }
   };
 
   /**
+  * Shows the tab contents for the given navigation tab.
+  * @param {!Element} tab The tab that the user clicked.
+  */
+  OptionsPage.showTab = function(tab) {
+    if (!tab.classList.contains('inactive-tab'))
+      return;
+
+    if (this.activeNavTab != null) {
+      this.activeNavTab.classList.remove('active-tab');
+      $(this.activeNavTab.getAttribute('tab-contents')).classList.
+          remove('active-tab-contents');
+    }
+
+    tab.classList.add('active-tab');
+    $(tab.getAttribute('tab-contents')).classList.add('active-tab-contents');
+    this.activeNavTab = tab;
+  }
+
+  /**
    * Registers new options page.
    * @param {OptionsPage} page Page to register.
    */
   OptionsPage.register = function(page) {
     OptionsPage.registeredPages_[page.name] = page;
     // Create and add new page <li> element to navbar.
     var pageNav = document.createElement('li');
     pageNav.id = page.name + 'PageNav';
     pageNav.className = 'navbar-item';
     pageNav.setAttribute('pageName', page.name);
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     }
   };
 
   // Export
   return {
     OptionsPage: OptionsPage
   };
 
 });