Merge "Prevent the thread unsafe operation during the user switching" into tm-qpr-dev am: ed37dc9b05 am: 1799dee8c1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21447325

Change-Id: I38511ee9832c611e94f15039975a0e819c14127b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>