Merge "RpcSession attaches/detaches thread on JVM (second attempt)" am: a2c63abe78 am: 1b796e62ad am: c7a703cc51 am: 844837e8fd

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1767689

Change-Id: I5219e708ea58dc3882e4067218cf732617a74bb4