Merge "Draw rounded corners above the taskbar" into sc-v2-dev am: 83e6d67e37 am: a2d2886007

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15662818

Change-Id: I71835d0183970e86df73675bcefd23f79d13af06