Merge changes I00aefb70,I7c722048 am: eb61e8bf am: 7aadfdf6

android/app/jni/com_android_bluetooth_vc.cpp

...om/android/bluetooth/vc/VolumeControlNativeInterface.java

...pp/src/com/android/bluetooth/vc/VolumeControlService.java

...src/com/android/bluetooth/vc/VolumeControlStackEvent.java

system/binder/Android.bp

system/binder/android/bluetooth/IBluetoothVolumeControl.aidl

...er/android/bluetooth/IBluetoothVolumeControlCallback.aidl

system/bta/include/bta_vc_api.h

system/bta/vc/device.cc

system/bta/vc/devices.h

system/bta/vc/devices_test.cc

system/bta/vc/types.h

system/bta/vc/vc.cc

system/bta/vc/vc_test.cc

system/btif/src/bluetooth.cc

system/btif/src/btif_vc.cc

system/include/hardware/bt_vc.h

system/test/mock/mock_bta_vc_device.cc