Merge "Explicitly add "flush-broadcast-loopers" option." into udc-dev am: 5835f7d555

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23328616

Change-Id: I3da3e2e57c7702a1eeab3f28955615c060f3495f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>