This function is called by the Permission implementation to update the properties of the permission.
You should never call this function except from a Permission implementation.
GObject notify signals are generated, as appropriate.
| this |
a Permission instance |
| allowed |
the new value for the 'allowed' property |
| can_acquire |
the new value for the 'can-acquire' property |
| can_release |
the new value for the 'can-release' property |