guess_profile_async
Description:
Asynchronously guesses DLNA profile for given uri.
When guessing is done, done signal is emitted on this.
Parameters:
| this | 
           ProfileGuesser object to use for guessing.  | 
      
| uri | 
           URI of media.  | 
      
| timeout_in_ms | 
           Timeout of guessing in miliseconds.  | 
      
Returns:
| 
           true if   |