[automerger skipped] Merge "Add nullable annotations to startActivityAsUser" am: 743a4b7872 am: 2704d2f4f6
am: f6ae002aba -s ours
am skip reason: change_id I9b61d833a68528f168611c83a8539eb095a42e01 with SHA1 ebc927c382 is in history

Change-Id: Ic706a6f014ef498bbc3776bea4168929cd7a2e90