Merge "Add gravity center to layout params" into sc-dev am: 98a49679 am:...

Merge "Add gravity center to layout params" into sc-dev am: 98a49679 am: a1089252 am: 4766c920

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15411507

Change-Id: I56c17afb240ab92619228587c29ac9a08132ebfa