Ahh nice, sounds like a good setup. Did you use an open source library for the server side part of WebRTC? I'm super interested in having a play with a good implementation if you have any tips..
var wrtc = require('electron-webrtc')({ headless: true });
var SimplePeer = require('simple-peer');
var requestify = require('requestify');
var dgram = require('dgram');
I haven't looked into exploiting the new true headless mode in Chrome yet, which should simplify things a lot. I'm also thinking of doing a full port to Go for WebRTC. That's a lot of stuff, however.