Merge "Makes Flash Notifications preview broadcasts be protected" into udc-dev am: 35f1dc05

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21690642



Change-Id: Ia11e6be38f3b2d4c80d968b94eacfc9ddf11441f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>