Displaying the extensions count in extensions settings page.

chrome/browser/resources/options/extension_settings.js

 // Copyright (c) 2011 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.
 
 // Used for observing function of the backend datasource for this page by
 // tests.
 var webui_responded_ = false;
 
 cr.define('options', function() {
   var OptionsPage = options.OptionsPage;
@@ skipping 135 matching lines @@
    * Called by the dom_ui_ to re-populate the page with data representing
    * the current state of installed extensions.
    */
   ExtensionSettings.returnExtensionsData = function(extensionsData) {
     webui_responded_ = true;
 
     $('no-extensions').hidden = true;
     $('suggest-gallery').hidden = true;
     $('get-more-extensions-container').hidden = true;
 
+    // Append extension count to extensionSettingsTitle and frame
+    // the extension header string. If there are no extensions loaded
+    // then display title as Extensions only.
+    $('extension-settings-header').hidden = false;
+    $('dev-toggle').hidden = false;
+    var extensionSettingsHeader = templateData.extensionSettingsTitle;
+    if (extensionsData.extensions.length > 0) {
+      extensionSettingsHeader = templateData.extensionSettingsTitle + " (" +
+          extensionsData.extensions.length + ")";
+    }
+
+    $('extension-settings-header').innerText = extensionSettingsHeader;
+
     if (extensionsData.extensions.length > 0) {
       // Enforce order specified in the data or (if equal) then sort by
       // extension name (case-insensitive).
       extensionsData.extensions.sort(function(a, b) {
         if (a.order == b.order) {
           a = a.name.toLowerCase();
           b = b.name.toLowerCase();
           return a < b ? -1 : (a > b ? 1 : 0);
         } else {
           return a.order < b.order ? -1 : 1;
@@ skipping 10 matching lines @@
 
     var extensionList = $('extension-settings-list');
     ExtensionsList.decorate(extensionList);
   }
 
   // Export
   return {
     ExtensionSettings: ExtensionSettings
   };
 });