Merge "Add api for systemUi getting split visibility" into sc-v2-dev am: ff254dd71f am: 39092ebc10

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15298110

Change-Id: Ia5248cfc12f4c0d124b35b8085c80e0439980f03