Re: [w3c/ServiceWorker] Provide a one-line way to listen for a waiting Service Worker (#1222)

In a comment on #1247 that I think was directed at this proposal, @jakearchibald wrote:
> A promise doesn't really work in this case, as many service workers can pass through the waiting phase during the life of a page.

If a promise is entirely off the table, then that entails that the best hope for an improvement here is for `statechange` events to bubble up to the registration; that's issue #1247.

```js
navigator.serviceWorker.ready.then(function(reg) {
  if (reg.waiting) return alertUser(reg);
  return reg.addEventListener('statechange', function(e) {
    if (e.target.state === 'installed') alertUser(reg);
  });
});
```

As I said above in this thread, this isn't what I'd prefer, but at this point, I'm going to give up on my favorite thing in favor of something (_anything_) getting done here.

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