Re: [ServiceWorker] Cancelling HTTP fetch (#592)

Or more generally, it might be named `controller`.

```
Promise<Response> fetch(
    RequestInfo input,
    optional RequestInit,
    optional controllerReceiver);
```

```
let controller;
fetch(url, {}, controller_ => {
  controller = controller_;
});
...
controller.abort();
```

It seems it's not appropriate to include the controller revealer to `RequestInit` since it's associated with each `fetch()` operation invocation. Not with each `Request` object. So, maybe, as a third parameter (or in the third parameter which is a dictionary).

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