Merge "Make system bars appearence logic more generic (2/N)" into sc-v2-dev...

Merge "Make system bars appearence logic more generic (2/N)" into sc-v2-dev am: f612f5ed am: eba8ce21

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15073690

Change-Id: I33021bb547d6c1b676c935811e50e2dba9c812dc