Merge "Make flushing broadcast loopers optional." into udc-dev am: 3e7d7d63 am: f7493c02 am: 2ff4b0cb

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



Change-Id: Ib06ea2db1b462bfd059156e4d2645c41dcce3ab3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>