Re: synchronous error handling.

FWIW, In the implementation in https://bugs.webkit.org/attachment.cgi?id=24627&action=prettypatch

I implemented it call the error callback before returning from  
getCurrentPosition and watchPosition. If the caller doesn't supply an  
errorCallback, the method will return and the caller will not know of  
this error. Perhaps there can be some kind of an exception thrown?

Any clarity here would be appreciated.

Thanks,
-- Greg