Add synchronization for PermissionData.

Concurrent modifications of mUserStates need to be synchronized.

Fixes: 142476570
Test: presubmit
Change-Id: If0f57bd8027a5631a81f377907205db67d6979a8
(cherry picked from commit 5abe3e102e8e8d505f2d48b427df8ce4880f5289)
1 file changed