Bug 872907 - Patch 1: Implement BluetoothA2dpManager, r=echou, r=mrbkap
Bug 872907 - Patch 2: Implement SendSinkMessage in BluetoothService, r=echou, r=mrbkap
Bug 872907 - Patch 3: Handle Sink property change, r=echou, r=mrbkap
Bug 872907 - Patch 4: Implement NotifyStatusChagned() and NotifyAudioManager(), r=echou, r=mrbkap
Bug 872907 - Patch 5: Handle A2DP status changed in AudioManager, r=echou, r=mwu