Merge "Get PiP round corner radius from WMShell" into sc-dev am: e74e32ab4c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14343433

Change-Id: Ic8ec7eb0a2bd8b28d52766e9b2392c822b1af22b