It seems doubtful this would happen as I would expect we would see a PC program for this already.
Seems Google is very protective of what you can do on the PC side with CCast.
Plex is even prohibited from allowing you to send content to a CCast from the local Media Manager and you are forced to go to the Plex.tv site in order to send to CCast via the PC.
It's as if they are worried that if the code to send is locally available to be viewed something would be exposed. What it is I can't say (read Don't Know)!