Fix TTS extension API language matching.

chrome/test/data/extensions/api_test/tts_engine/lang_matching/test.js

+// Copyright (c) 2011 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 on ChromeOS.
+// browser_tests.exe --gtest_filter="TtsApiTest.*"
+
+chrome.test.runTests([
+  function testWordCallbacks() {
+    // Register listeners for speech functions, enabling this extension
+    // to be a TTS engine.
+    var speakListener = function(utterance, options, sendTtsEvent) {
+      chrome.test.assertNoLastError();
+      sendTtsEvent({'type': 'end', 'charIndex': utterance.length});
+    };
+    var stopListener = function() {};
+    chrome.ttsEngine.onSpeak.addListener(speakListener);
+    chrome.ttsEngine.onStop.addListener(stopListener);
+
+    // Make sure that a lang of 'fr-FR' goes to our engine,
+    // even though the engine only registered 'fr'.
+    chrome.tts.speak(
+        'dummy utterance',
+        {
+         'lang': 'fr-FR',
+         'onEvent': function(event) {
+           chrome.test.assertNoLastError();
+           chrome.test.succeed();
+         }
+        },
+        function() {
+          chrome.test.assertNoLastError();
+        });
+  }
+]);