DarkMode Tile affects all users + security bug When setNightModeActivated is called, the change affects the current logged in user Also, permission checks are made before changing dark theme Test: manual Bug: 168039904 Merged-In: I7786d9dde10f7547f5dd9fb00661fb89fde9f05c Change-Id: I7786d9dde10f7547f5dd9fb00661fb89fde9f05c (cherry picked from commit f16e87a992d7d6c1d367770bd569707a29cb15b4)