var url = proto +http://www.googleadservices.com/pagead/conversion/http/extclk?random=213800 serves up a tracking pixel.
"//www.googleadservices.com/pagead/conversion/" +
escape(w.google_conversion_id) + path +
"random=" + (new Date()).getTime();
url = url + google_language_code();http://services.google.com/sitestats/en_US.html?cid=http is an example of what will be served up.
var link = proto + "//services.google.com/sitestats/" +
google_get_filename() + "?cid=" + escape(w.google_conversion_id);
The conversion.js file doesn't really seem to convert anything, rather is seems like standard ad tracking/documenting system. With this in mind is seems like Google is trying to add ads to Google Docs. This does seem like a logical step. Perhaps we'll see a similar system to what we find in Gmail.