(MickoWIP) propagate mouse events to librocket

git-svn-id: svn://dspnet.fr/mame/branches/micko@24495 749742ba-7341-0410-aadc-df50b521781e
(MickoWIP) Small patch to get proper dimensions

git-svn-id: svn://dspnet.fr/mame/branches/micko@24496 749742ba-7341-0410-aadc-df50b521781e