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diff --git a/device/bluetooth/bluetooth_audio_sink_chromeos.h b/device/bluetooth/bluetooth_audio_sink_chromeos.h
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+// Copyright 2015 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 DEVICE_BLUETOOTH_BLUETOOTH_AUDIO_SINK_CHROMEOS_H_
+#define DEVICE_BLUETOOTH_BLUETOOTH_AUDIO_SINK_CHROMEOS_H_
+
+#include <stdint.h>
+#include <string>
+#include <vector>
+
+#include "base/files/file.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/observer_list.h"
+#include "dbus/file_descriptor.h"
+#include "dbus/object_path.h"
+#include "device/bluetooth/bluetooth_adapter.h"
+#include "device/bluetooth/bluetooth_audio_sink.h"
+#include "device/bluetooth/bluetooth_export.h"
+#include "device/bluetooth/dbus/bluetooth_media_client.h"
+#include "device/bluetooth/dbus/bluetooth_media_endpoint_service_provider.h"
+#include "device/bluetooth/dbus/bluetooth_media_transport_client.h"
+
+namespace chromeos {
+
+class BluetoothAudioSinkChromeOSTest;
+
+class DEVICE_BLUETOOTH_EXPORT BluetoothAudioSinkChromeOS
+    : public device::BluetoothAudioSink,
+      public device::BluetoothAdapter::Observer,
+      public bluez::BluetoothMediaClient::Observer,
+      public bluez::BluetoothMediaTransportClient::Observer,
+      public bluez::BluetoothMediaEndpointServiceProvider::Delegate,
+      public base::MessageLoopForIO::Watcher {
+ public:
+  explicit BluetoothAudioSinkChromeOS(
+      scoped_refptr<device::BluetoothAdapter> adapter);
+
+  // device::BluetoothAudioSink overrides.
+  // Unregisters a BluetoothAudioSink. |callback| should handle
+  // the clean-up after the audio sink is deleted successfully, otherwise
+  // |error_callback| will be called.
+  void Unregister(
+      const base::Closure& callback,
+      const device::BluetoothAudioSink::ErrorCallback& error_callback) override;
+  void AddObserver(BluetoothAudioSink::Observer* observer) override;
+  void RemoveObserver(BluetoothAudioSink::Observer* observer) override;
+  device::BluetoothAudioSink::State GetState() const override;
+  uint16_t GetVolume() const override;
+
+  // Registers a BluetoothAudioSink. User applications can use |options| to
+  // configure the audio sink. |callback| will be executed if the audio sink is
+  // successfully registered, otherwise |error_callback| will be called. Called
+  // by BluetoothAdapterChromeOS.
+  void Register(
+      const device::BluetoothAudioSink::Options& options,
+      const base::Closure& callback,
+      const device::BluetoothAudioSink::ErrorCallback& error_callback);
+
+  // Returns a pointer to the media endpoint object. This function should be
+  // used for testing purpose only.
+  bluez::BluetoothMediaEndpointServiceProvider* GetEndpointServiceProvider();
+
+ private:
+  ~BluetoothAudioSinkChromeOS() override;
+
+  // device::BluetoothAdapter::Observer overrides.
+  void AdapterPresentChanged(device::BluetoothAdapter* adapter,
+                             bool present) override;
+  void AdapterPoweredChanged(device::BluetoothAdapter* adapter,
+                             bool powered) override;
+
+  // bluez::BluetoothMediaClient::Observer overrides.
+  void MediaRemoved(const dbus::ObjectPath& object_path) override;
+
+  // bluez::BluetoothMediaTransportClient::Observer overrides.
+  void MediaTransportRemoved(const dbus::ObjectPath& object_path) override;
+  void MediaTransportPropertyChanged(const dbus::ObjectPath& object_path,
+                                     const std::string& property_name) override;
+
+  // bluez::BluetoothMediaEndpointServiceProvider::Delegate overrides.
+  void SetConfiguration(const dbus::ObjectPath& transport_path,
+                        const TransportProperties& properties) override;
+  void SelectConfiguration(
+      const std::vector<uint8_t>& capabilities,
+      const SelectConfigurationCallback& callback) override;
+  void ClearConfiguration(const dbus::ObjectPath& transport_path) override;
+  void Released() override;
+
+  // base::MessageLoopForIO::Watcher overrides.
+  void OnFileCanReadWithoutBlocking(int fd) override;
+  void OnFileCanWriteWithoutBlocking(int fd) override;
+
+  // Acquires file descriptor via current transport object when the state change
+  // is triggered by MediaTransportPropertyChanged.
+  void AcquireFD();
+
+  // Watches if there is any available data from |fd_|.
+  void WatchFD();
+
+  // Stops watching |fd_| and resets |fd_|.
+  void StopWatchingFD();
+
+  // Reads from the file descriptor acquired via Media Transport object and
+  // notify |observer_| while the audio data is available.
+  void ReadFromFile();
+
+  // Called when the state property of BluetoothMediaTransport has been updated.
+  void StateChanged(device::BluetoothAudioSink::State state);
+
+  // Called when the volume property of BluetoothMediaTransport has been
+  // updated.
+  void VolumeChanged(uint16_t volume);
+
+  // Called when the registration of Media Endpoint has succeeded.
+  void OnRegisterSucceeded(const base::Closure& callback);
+
+  // Called when the registration of Media Endpoint failed.
+  void OnRegisterFailed(
+      const device::BluetoothAudioSink::ErrorCallback& error_callback,
+      const std::string& error_name,
+      const std::string& error_message);
+
+  // Called when the unregistration of Media Endpoint has succeeded. The
+  // clean-up of media, media transport and media endpoint will be handled here.
+  void OnUnregisterSucceeded(const base::Closure& callback);
+
+  // Called when the unregistration of Media Endpoint failed.
+  void OnUnregisterFailed(
+      const device::BluetoothAudioSink::ErrorCallback& error_callback,
+      const std::string& error_name,
+      const std::string& error_message);
+
+  // Called when the file descriptor, read MTU and write MTU are retrieved
+  // successfully using |transport_path_|.
+  void OnAcquireSucceeded(dbus::FileDescriptor* fd,
+                          const uint16_t read_mtu,
+                          const uint16_t write_mtu);
+
+  // Called when acquiring the file descriptor, read MTU and write MTU failed.
+  void OnAcquireFailed(const std::string& error_name,
+                       const std::string& error_message);
+
+  // Called when the file descriptor is released successfully.
+  void OnReleaseFDSucceeded();
+
+  // Called when it failed to release file descriptor.
+  void OnReleaseFDFailed(const std::string& error_name,
+                         const std::string& error_message);
+
+  // Helper functions to clean up media, media transport and media endpoint.
+  // Called when the |state_| changes to either STATE_INVALID or
+  // STATE_DISCONNECTED.
+  void ResetMedia();
+  void ResetTransport();
+  void ResetEndpoint();
+
+  // The connection state between the BluetoothAudioSinkChromeOS and the remote
+  // device.
+  device::BluetoothAudioSink::State state_;
+
+  // The volume control by the remote device during the streaming. The valid
+  // range of volume is 0-127, and 128 is used to represent invalid volume.
+  uint16_t volume_;
+
+  // Read MTU of the file descriptor acquired via Media Transport object.
+  uint16_t read_mtu_;
+
+  // Write MTU of the file descriptor acquired via Media Transport object.
+  uint16_t write_mtu_;
+
+  // Flag for logging the read failure in ReadFromFD.
+  bool read_has_failed_;
+
+  // The file which takes ownership of the file descriptor acquired via Media
+  // Transport object.
+  scoped_ptr<base::File> file_;
+
+  // To avoid reallocation of memory, data will be updated only when |read_mtu_|
+  // changes.
+  scoped_ptr<char[]> data_;
+
+  // File descriptor watcher for the file descriptor acquired via Media
+  // Transport object.
+  base::MessageLoopForIO::FileDescriptorWatcher fd_read_watcher_;
+
+  // Object path of the media object being used.
+  dbus::ObjectPath media_path_;
+
+  // Object path of the transport object being used.
+  dbus::ObjectPath transport_path_;
+
+  // Object path of the media endpoint object being used.
+  dbus::ObjectPath endpoint_path_;
+
+  // BT adapter which the audio sink binds to. |adapter_| should outlive
+  // a BluetoothAudioSinkChromeOS object.
+  scoped_refptr<device::BluetoothAdapter> adapter_;
+
+  // Options used to initiate Media Endpoint and select configuration for the
+  // transport.
+  device::BluetoothAudioSink::Options options_;
+
+  // Media Endpoint object owned by the audio sink object.
+  scoped_ptr<bluez::BluetoothMediaEndpointServiceProvider> media_endpoint_;
+
+  // List of observers interested in event notifications from us. Objects in
+  // |observers_| are expected to outlive a BluetoothAudioSinkChromeOS object.
+  base::ObserverList<BluetoothAudioSink::Observer> observers_;
+
+  // Note: This should remain the last member so it'll be destroyed and
+  // invalidate its weak pointers before any other members are destroyed.
+  base::WeakPtrFactory<BluetoothAudioSinkChromeOS> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BluetoothAudioSinkChromeOS);
+};
+
+}  // namespace chromeos
+
+#endif  // DEVICE_BLUETOOTH_BLUETOOTH_AUDIO_SINK_CHROMEOS_H_