device/bluetooth: Add Bluetooth Audio Sink base class.

device/bluetooth/bluetooth_audio_sink.cc

+// Copyright 2014 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 "device/bluetooth/bluetooth_audio_sink.h"
+
+namespace device {
+
+BluetoothAudioSink::Options::Options()
+    : codec(0x00), capabilities({0x3f, 0xff, 0x12, 0x35}) {

[armansito, 2014/12/03 20:14:12]

Why this default value for capabilities specifically? You should document what
these values mean here, both for the codec and capabilities.

[Miao, 2014/12/03 22:56:28]

Done.

+}
+
+BluetoothAudioSink::Options::~Options() {
+}
+
+BluetoothAudioSink::BluetoothAudioSink() {
+}
+
+BluetoothAudioSink::~BluetoothAudioSink() {
+}
+
+
+}  // namespace device