Add link to the Advanced Font Settings extension in Font Settings

chrome/browser/ui/webui/options/font_settings_browsertest.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.
 
 /**
  * TestFixture for font settings WebUI testing.
  * @extends {testing.Test}
  * @constructor
  **/
 function FontSettingsWebUITest() {}
 
 FontSettingsWebUITest.prototype = {
   __proto__: testing.Test.prototype,
 
   /**
    * Browse to the font settings page.
    **/
   browsePreload: 'chrome://settings-frame/fonts',
+
+  /** @inheritDoc */
+  preLoad: function() {
+    this.makeAndRegisterMockHandler(['openAdvancedFontSettingsOptions']);
+  }
 };
 
 // Test opening font settings has correct location.
 TEST_F('FontSettingsWebUITest', 'testOpenFontSettings', function() {
   assertEquals(this.browsePreload, document.location.href);
 });
+
+// Test setup of the Advanced Font Settings links.
+TEST_F('FontSettingsWebUITest', 'testAdvancedFontSettingsLink', function() {
+  var installElement = $('advanced-font-settings-install');
+  var optionsElement = $('advanced-font-settings-options');
+  var expectedUrl = 'https://chrome.google.com/webstore/detail/' +
+      'caclkomlalccbpcdllchkeecicepbmbm';
+
+  FontSettings.notifyAdvancedFontSettingsAvailability(false);
+  assertFalse(installElement.hidden);
+  assertEquals(expectedUrl, installElement.querySelector('a').href);
+  assertTrue(optionsElement.hidden);
+
+  FontSettings.notifyAdvancedFontSettingsAvailability(true);
+  assertTrue(installElement.hidden);
+  assertFalse(optionsElement.hidden);
+  this.mockHandler.expects(once()).openAdvancedFontSettingsOptions();
+  optionsElement.click();
+});