Merge "Round bottom corners for notif before shelf after swipe ends" into sc-dev am: ece342ba am: 45ed3b2c am: 18d0e8d0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15181380

Change-Id: I4ef4004fcfc5a616e5256aa4479926828afad4fb