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: 726af906 am: 452e0607

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

Change-Id: Id00bc1942aab7db2b3878f8afc8f7ef9f3d04454