Implement web speech synthesis.

content/public/common/tts_utterance_request.cc

+// 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.
+
+#include "content/public/common/tts_utterance_request.h"
+
+namespace content {
+
+TtsUtteranceRequest::TtsUtteranceRequest()
+    : id(0),
+      volume(1.0),
+      rate(1.0),
+      pitch(1.0) {
+}
+
+TtsUtteranceRequest::~TtsUtteranceRequest() {
+}
+
+TtsVoice::TtsVoice()
+    : local_service(true),
+      is_default(false) {
+}
+
+TtsVoice::~TtsVoice() {
+}
+
+TtsUtteranceResponse::TtsUtteranceResponse()
+    : id(0) {
+}
+
+TtsUtteranceResponse::~TtsUtteranceResponse() {
+}
+
+}  // namespace content