Merge "Make system bars appearence logic more generic (3/N)" into sc-v2-dev...

Merge "Make system bars appearence logic more generic (3/N)" into sc-v2-dev am: f335f847 am: 327d3b25

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14909653

Change-Id: I14876503de79d068d027762165ddb864f8749951