Implement web speech synthesis.

chrome/browser/speech/tts_request_handler.h

+// Copyright (c) 2013 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.
+
+#ifndef CHROME_BROWSER_SPEECH_TTS_REQUEST_HANDLER_H_
+#define CHROME_BROWSER_SPEECH_TTS_REQUEST_HANDLER_H_
+
+#include "base/compiler_specific.h"
+#include "content/public/browser/tts_dispatcher_host.h"
+
+class TtsRequestHandler : public content::TtsDispatcherHostDelegate {
+ public:
+  TtsRequestHandler();
+  virtual ~TtsRequestHandler();
+
+  // TtsDispatcherHostDelegate.
+  virtual void OnInitializeVoiceList(
+      content::TtsDispatcherHost* dispatcher_host,
+      int routing_id) OVERRIDE;
+  virtual void OnSpeak(content::TtsDispatcherHost* dispatcher_host,
+                       int routing_id,
+                       const content::TtsUtteranceRequest&) OVERRIDE;
+  virtual void OnPause(content::TtsDispatcherHost* dispatcher_host) OVERRIDE;
+  virtual void OnResume(content::TtsDispatcherHost* dispatcher_host) OVERRIDE;
+  virtual void OnCancel(content::TtsDispatcherHost* dispatcher_host) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TtsRequestHandler);
+};
+
+#endif  // CHROME_BROWSER_SPEECH_TTS_REQUEST_HANDLER_H_