WebRTC wants you to use your browser to make voice and video calls. When this feature hits Chrome for Android, you do the same thing, from your phone. Video calling through the browser it is.
But with the last update for Chrome for Android beta, this feature is now on your Android phones too. You just need to enable the WebRTC flags from chrome://flags and restart the app.
You can visit http://simpl.info/getusermedia/ to give this a try. This page doesn’t do much, but it will help you test if this feature is working. You will be asked to allow the webpage to access your camera and mic. Once you touch Allow, you will start seeing video from your phone’s camera there.
That’s not much, I know. But if you want to know what WebRTC is aiming at, take a look at this video (from Mozilla)