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

Two cents. I'm not sold that `navigator.serviceWorker.waiting` is the right naming here.

I would actually prefer some way of listener for changes for the service worker that updating along the lines of:

```javascript
reg.addEventListener('updatestatechange', (event) => {
  switch(event.state) {
    case 'installing':
      break;
    case 'waiting':
      break;
    case 'activating':
      break;
    case 'activated':
      break;
  }
});
```

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