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

Merge "Explicitly add "flush-broadcast-loopers" option." into udc-dev am: 5835f7d5 am: a2757770 am: 9374bf0b

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



Change-Id: I529726c94c9c0a7c00589b730d62a3a014d8543c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>