[slightlyoff/ServiceWorker] what is the best way to save Request while offline ? (#904)

if I wanna send data to sever from page, but wanna also support offline using background sync.

```js
// sending body 'a=b' to server
self.addEventListener('fetch', (e) => {
  let req = e.request;
  // delegate to background sync
  self.addEventListener('sync', (e) => {
    fetch(req).then(/*....*/)
  });
  e.respondTo(new Response('dummy'));
});
```

but in this case, `req` are at local memory, so this will remove when service worker process are down before sync event fired (in my understanding).

so I need to save `req` to somewhere.
but I don't have response, for saving this to caches.
(saving request with dummy response to caches seems bad hack.)

should I keep body in this request to indexed db ?
it seems heavy for me to initialise / saving / getting IDB for saving only **"a=b"**.

localStorage seems fit with this, 
it's handy to save body 'a=b' with some key and grab this when 'sync' event.
but I know that I can't touch it in sw because of sync api.

is there any other way to save body or request ?
or localStorage will have Async API (returning promise) are welcome !!

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