Uses a system-wide notion of isSpeaking in the Mac extension TTS api.

chrome/browser/speech/extension_api/tts_extension_apitest.cc

 // 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.
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/speech/extension_api/tts_extension_api.h"
@@ skipping 31 matching lines @@
   }
 
 
   MOCK_METHOD4(Speak,
                bool(int utterance_id,
                     const std::string& utterance,
                     const std::string& lang,
                     const UtteranceContinuousParameters& params));
   MOCK_METHOD0(StopSpeaking, bool(void));
 
+  MOCK_METHOD0(IsSpeaking, bool(void));
+
   void SetErrorToEpicFail() {
     set_error("epic fail");
   }
 
   void SendEndEvent(int utterance_id,
                     const std::string& utterance,
                     const std::string& lang,
                     const UtteranceContinuousParameters& params) {
     MessageLoop::current()->PostDelayedTask(
         FROM_HERE, base::Bind(
@@ skipping 233 matching lines @@
   EXPECT_CALL(mock_platform_impl_, StopSpeaking())
       .WillRepeatedly(Return(true));
 
   ASSERT_TRUE(RunExtensionTest("tts_engine/engine_word_callbacks")) << message_;
 }
 
 // http://crbug.com/122474
 IN_PROC_BROWSER_TEST_F(TtsApiTest, EngineApi) {
   ASSERT_TRUE(RunExtensionTest("tts_engine/engine_api")) << message_;
 }