Refactored TTS extension code so that the platform-specific TTS...

chrome/test/data/extensions/api_test/tts/chromeos/test.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.
 
-// TTS api test for Chrome. This is currently limited to ChromeOS.
-// browser_tests.exe --gtest_filter=ExtensionApiTest.Tts
+// TTS api test for Chrome on ChromeOS.
+// browser_tests.exe --gtest_filter=ExtensionApiTest.TtsOnChromeOs
 
 chrome.test.runTests([
   function testSpeak() {
     chrome.experimental.tts.speak('hello world', {}, function() {
           chrome.test.succeed();
         });
   },
 
   function testStop() {
     chrome.experimental.tts.stop();
     chrome.test.succeed();
   },
 
   function testIsSpeaking() {
     for (var i = 0; i < 3; i++) {
       chrome.experimental.tts.isSpeaking(function(speaking) {
             chrome.test.assertTrue(speaking);
           });
     }
     chrome.experimental.tts.isSpeaking(function(speaking) {
             chrome.test.assertFalse(speaking);
             chrome.test.succeed();
           });
   }
-]);
+]);