Import Chrome's tts code

chromium_src/chrome/browser/speech/tts_platform.cc

@@ -0,0 +1,28 @@
+// 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 "chrome/browser/speech/tts_platform.h"
+
+#include <string>
+
+bool TtsPlatformImpl::LoadBuiltInTtsExtension(
+    content::BrowserContext* browser_context) {
+  return false;
+}
+
+std::string TtsPlatformImpl::error() {
+  return error_;
+}
+
+void TtsPlatformImpl::clear_error() {
+  error_ = std::string();
+}
+
+void TtsPlatformImpl::set_error(const std::string& error) {
+  error_ = error;
+}
+
+void TtsPlatformImpl::WillSpeakUtteranceWithVoice(const Utterance* utterance,
+                                                  const VoiceData& voice_data) {
+}