Merge "Only update the compat system UI visibility if the source is valid" into tm-dev am: 1fab4540 am: 8893bc9d am: d95834c2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18583184



Change-Id: I08d4a8ab67a2c166960e3f66036bdb43d64f8896
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>