Implement web speech synthesis.

content/public/common/tts_utterance_request.h

Index: content/public/common/tts_utterance_request.h
diff --git a/content/public/common/tts_utterance_request.h b/content/public/common/tts_utterance_request.h
new file mode 100644
index 0000000000000000000000000000000000000000..aef3c411145cfd46a6f5c76024f8447b74d95425
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+++ b/content/public/common/tts_utterance_request.h
@@ -0,0 +1,49 @@
+// 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 CONTENT_PUBLIC_COMMON_TTS_UTTERANCE_REQUEST_H
+#define CONTENT_PUBLIC_COMMON_TTS_UTTERANCE_REQUEST_H
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/string16.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+struct CONTENT_EXPORT TtsUtteranceRequest {
+  TtsUtteranceRequest();
+  ~TtsUtteranceRequest();
+
+  int id;
+  std::string text;
+  std::string lang;
+  std::string voice;
+  float volume;
+  float rate;
+  float pitch;
+};
+
+struct CONTENT_EXPORT TtsVoice {
+  TtsVoice();
+  ~TtsVoice();
+
+  std::string voice_uri;
+  std::string name;
+  std::string lang;
+  bool local_service;
+  bool is_default;
+};
+
+struct CONTENT_EXPORT TtsUtteranceResponse {
+  TtsUtteranceResponse();
+  ~TtsUtteranceResponse();
+
+  int id;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_COMMON_SPEECH_RECOGNITION_RESULT_H_