Re: [ServiceWorker] Can caches store and retrieve results that are still being written to the cache? (#573)

Agree with @wanderview.

@annevk do you think this is a sensible thing to live in Fetch? An option to *only* get the response if it's currently in-flight. So:

```js
fetch('/').then(function(response) {
   // ...
});

fetch('/', {
  onlyInFlightStuffPlease: true
}).then(function(response) {
   // ...
});
```

…would only result in one network request, and the 2nd response is a clone of the first? There are lots of details of course, just trying to work out if it's something we *should* enable. The "in-flight" request list would be origin specific of course.

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