Re: [w3c/ServiceWorker] async waitUntil microtask issue (#1213)

Just a question: is the dispatch flag set whenever you are in a microtask "chained" to the original event dispatch? e.g., does this throw?
```
onfetch = e => {
  Promise.resolve().then(_ => Promise.resolve()).then(_ => Promise.resolve()).then(_ => e.waitUntil(p));
};
```

Similarly how about this one:
```
onfetch = e => {
  e.waitUntil(some_promise);
  some_promise.then(_ => Promise.resolve()).then(_ => Promise.resolve()).then(_ => e.waitUntil(another_promise));
};
```

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