Merge "Explicitly add "flush-broadcast-loopers" option." into udc-dev am: 5835f7d5 am: 903ab0ae

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



Change-Id: I66e4eae1d33a3994bee8b14d4df7ec09af6e06c1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>