Merge "Clear calling identity in TransactionHangCallback" into udc-dev am: d5cc57fc am: d8eafa28

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22794380



Change-Id: Ifc9a5660f9b8a4bd0471bb67f57d3476525e166f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>