Add getFontList() to Font Settings Extension API.

chrome/test/data/extensions/api_test/font_settings/test.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.
 
 // Font settings API test
 // Run with browser_tests --gtest_filter=ExtensionApiTest.FontSettings
 
 var fs = chrome.experimental.fontSettings;
 
 function expect(expected, message) {
@@ skipping 27 matching lines @@
     }, chrome.test.callbackPass());
   },
 
   function getGlobalFontName() {
     var expected = 'Arial';
     var message =
         'Setting for global sansserif font should be ' + expected;
     fs.getFontName({
       genericFamily: 'sansserif'
     }, expect({fontName: expected}, message));
+  },
+
+  function getFontList() {
+    var message = 'getFontList should return an array of objects with ' +
+        'fontName and localizedName properties.';
+    fs.getFontList(chrome.test.callbackPass(function(value) {
+      chrome.test.assertTrue(value.length > 0,
+                             "Font list is not expected to be empty.");
+      chrome.test.assertEq('string', typeof(value[0].fontName), message);
+      chrome.test.assertEq('string', typeof(value[0].localizedName), message);
+    }));
   }
 ]);