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

Merge "Avoid sending messages of destroyed Engine" into udc-dev am: 359c0a20 am: 3b1013b1 am: f18aded5 am: 8aaeb402

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



Change-Id: I5c88e391d5503dec10c4b9073e6a90d20babb4a7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>