Consider the following code:

console.log("1");
pc.createOffer(function(x) {
  console.log("2");
});
console.log("3");


I believe this should print out: 1 3 2

I.e., all API calls which take a callback should return prior to firing the
callback. The spec isn't really clear on this point for all of these calls, IMO, so if people agree we should update it to be clear ("queue a task...")