Merge "Add test method...

Merge "Add test method UserLifecycleStressTest.switchToExistingGuestAndStartOverStressTest" into tm-dev am: e1062bc7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17749723



Change-Id: Ia5127b332685c44c66bcf1e734a52e2e26e8fdba
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>