Merge "Turns on refactored UserSwitcherController." into tm-qpr-dev am: 67e174c81d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20168257

Change-Id: I65424455706fbd42917610d3aed303d5664b27ee
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>