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

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



Change-Id: I7cf47716f5eb2525c9ed23c4e1d8044fc4fc79f6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>