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

chrome/test/data/extensions/api_test/tts/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
-
-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();
-          });
-  }
-]);