Merge "Only update the compat system UI visibility if the source is valid"...

Merge "Only update the compat system UI visibility if the source is valid" into tm-dev am: 1fab4540 am: c19f57ce

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



Change-Id: I8819c56c80971d6c523f5147faf283b8770b9c3f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>