Search for items in the secret service.
The attributes should be a set of key and value string pairs.
This method will return immediately and complete asynchronously.
| schema |
the schema for attributes |
| attributes |
the attribute keys and values |
| flags |
search option flags |
| cancellable |
optional cancellation object |
| callback |
called when the operation completes |
| user_data |
data to be passed to the callback |