Re: [slightlyoff/ServiceWorker] Handling race conditions - API for accessing pending requests? (#959)

I guess something simple like this could be used:

```js
self.addEventListener('fetch', event => {
  self.requests.match(event.request).then(inflight => {
    return inflight || fetch(event.request);
  });
});
```
This also can potentially solve the issue in 
https://github.com/slightlyoff/ServiceWorker/issues/920

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