Merge "Adds AllSetActivity in Launcher." into sc-dev am: 19a1c4765f am: 4bad94b86d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14419322

Change-Id: I346fc2fe95376617c95f13d1a1647df9e362f9ab