Merge "Make flushing broadcast loopers optional." into udc-dev am: 3e7d7d63

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23224746



Change-Id: I9d898916def99a761e7625b6c53d87a5bee26a00
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>