Add link to the Advanced Font Settings extension in Font Settings

chrome/browser/resources/options/font_settings.js

Index: chrome/browser/resources/options/font_settings.js
diff --git a/chrome/browser/resources/options/font_settings.js b/chrome/browser/resources/options/font_settings.js
index 965df6ef49566a35de1148e417b97922283bbfbe..0b3f3f70a9ba731bfc72f755291d81a760911988 100644
--- a/chrome/browser/resources/options/font_settings.js
+++ b/chrome/browser/resources/options/font_settings.js
@@ -57,6 +57,10 @@ cr.define('options', function() {
       $('font-settings-confirm').onclick = function() {
         OptionsPage.closeOverlay();
       };
+
+      $('advanced-font-settings-options').onclick = function() {
+        chrome.send('openAdvancedFontSettingsOptions');
+      };
     },
 
     /**
@@ -234,6 +238,15 @@ cr.define('options', function() {
                                                 null, true);
   };
 
+  /**
+   * @param {boolean} available Whether the Advanced Font Settings Extension
+   *     is installed and enabled.
+   */
+  FontSettings.notifyAdvancedFontSettingsAvailability = function(available) {
+    $('advanced-font-settings-install').hidden = available;
+    $('advanced-font-settings-options').hidden = !available;
+  };
+
   // Export
   return {
     FontSettings: FontSettings