Enableling url field to be populated via URL

First thanks for creating a great site :)
This change enables client to set the url input field via an URL argument 'url'.
I am fiddling hobby project where i get a video URL from a REST API. I would like to sent it through your service to my Chromecast, so I need a way to provide the URL. 
I hope you can accept this request. 
-Tobias