Implement web speech synthesis.

chrome/common/tts_utterance_request.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_COMMON_TTS_UTTERANCE_REQUEST_H_
+#define CHROME_COMMON_TTS_UTTERANCE_REQUEST_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/string16.h"
+
+struct TtsUtteranceRequest {
+  TtsUtteranceRequest();
+  ~TtsUtteranceRequest();
+
+  int id;
+  std::string text;
+  std::string lang;
+  std::string voice;
+  float volume;
+  float rate;
+  float pitch;
+};
+
+struct TtsVoice {
+  TtsVoice();
+  ~TtsVoice();
+
+  std::string voice_uri;
+  std::string name;
+  std::string lang;
+  bool local_service;
+  bool is_default;
+};
+
+struct TtsUtteranceResponse {
+  TtsUtteranceResponse();
+  ~TtsUtteranceResponse();
+
+  int id;
+};
+
+#endif  // CHROME_COMMON_TTS_UTTERANCE_REQUEST_H_