Move the code in libcros' chromeos_speech_synthesis.cc into Chrome

chrome/browser/chromeos/dbus/speech_synthesizer_client.h

+// Copyright (c) 2011 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_CHROMEOS_DBUS_SPEECH_SYNTHESIZER_CLIENT_H_
+#define CHROME_BROWSER_CHROMEOS_DBUS_SPEECH_SYNTHESIZER_CLIENT_H_
+#pragma once
+
+#include <string>
+
+#include "base/callback.h"
+
+namespace dbus {
+class Bus;
+}
+
+namespace chromeos {
+
+// SpeechSynthesizerClient is used to communicate with the speech synthesizer.
+// All method should be called from the origin thread (UI thread) which
+// initializes the DBusThreadManager instance.
+class SpeechSynthesizerClient {
+ public:
+  // A callback function called when the result of IsSpeaking is ready.
+  // The argument indicates if the speech synthesizer is speaking or not.
+  typedef base::Callback<void(bool)> IsSpeakingCallback;
+
+  virtual ~SpeechSynthesizerClient() {}
+
+  // Speaks the specified text.
+  virtual void Speak(const std::string& text) = 0;
+
+  // Sets options for the subsequent speech synthesis requests.
+  // Use the constants below.
+  virtual void SetSpeakProperties(const std::string& props) = 0;
+
+  // Stops speaking the current utterance.
+  virtual void StopSpeaking() = 0;
+
+  // Checks if the engine is currently speaking.
+  // |callback| will be called on the origin thread later with the result.
+  virtual void IsSpeaking(IsSpeakingCallback callback) = 0;
+
+  // Factory function, creates a new instance and returns ownership.
+  // For normal usage, access the singleton via DBusThreadManager::Get().
+  static SpeechSynthesizerClient* Create(dbus::Bus* bus);
+
+  // Constants to be used with SetSpeakProperties.
+  static const char kSpeechPropertyLocale[];
+  static const char kSpeechPropertyGender[];
+  static const char kSpeechPropertyRate[];
+  static const char kSpeechPropertyPitch[];
+  static const char kSpeechPropertyVolume[];
+  static const char kSpeechPropertyEquals[];
+  static const char kSpeechPropertyDelimiter[];
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_DBUS_SPEECH_SYNTHESIZER_CLIENT_H_