Re: [w3c/ServiceWorker] Provide an easier way to listen for waiting/activating/redundant Service Workers (#1247)

Alerting users of a waiting service worker might look like this:

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

But I'd definitely prefer a `navigator.serviceWorker.waiting` promise for this common use case, as described in #1222.

```js
navigator.serviceWorker.waiting.then(alertUser);
```

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