Merge "Migrate LightRevealScrim and all dependencies to flows." into tm-qpr-dev am: dd1d999b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20470589



Change-Id: Iee036942dc3b96ecad7dc82f1859eecca10c5108
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>