Add a "client interest" for token on behalf of the given client.
This emits clients_interested if this was the first time a client expressed an interest in this token.
| this | |
| unique_name |
the unique bus name of a D-Bus client |
| token |
a D-Bus interface or a token representing part of an interface, added with add_possible_client_interest |
| only_if_uninterested |
only add to the interest count if the client is not already interested (appropriate for APIs that implicitly subscribe on first use if this has not been done already, like Location) |