Merge "Center EmptyShadeView vertically and horizontally." into sc-v2-dev am: 910a49a936 am: 668c88f8d0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16388642

Change-Id: If11d9215d726192a14efcd26d22c33fede98cbd5