Merge "Avoid sending messages of destroyed Engine" into udc-dev am: 359c0a20 am: 3b1013b1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24103711



Change-Id: Ibdab893f1547fecea2b09d02eb307030e8ff153d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>