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

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



Change-Id: I5a28058a64e298651a8a1f657ccf09dff00ba890
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>