Map the VehicleAudioContextFlag.UNKNOWN_FLAG to current context.

    + When vehicle hal is reporting volume change on unknown context, we
      will map it to the current context. This makes partner's
      implementation easier and our volume handling more robust.

    + Added test.

Bug: 62064580
Test: runtest -x packages/services/Car/tests/carservice_test/src/com/android/car/test/CarVolumeServiceTest.java

Change-Id: I488967e48e96f15f0094337282ef0b6f25465754
2 files changed