Re: [w3c/ServiceWorker] Pagination in cache.keys() (#1066)

Thanks @wanderview, I've updated the test here: https://rawgit.com/ConradIrwin/a634359060cbbde0e90a30e5744aa1a1/raw/94c524dcc451f7104b5fdf8999a56cc70db86ff2/storage.html (the time was actually less of a concern for me, as it's a relatively rare async event, the crash was the big problem in chrome).

@jakearchibald What does that syntax desugar to? In general happy to manually iterate over the collection, but the API doesn't support that yet.

```js
function paginate(cache, callback, offset) {
  return cache.keys(null, {limit: 1000, offset: offset || 0}).then((keys) =>
    for (key in keys) {
      callback(key);
    }
    if (keys.length === 1000) {
      return paginate(cache, callback, offset + 1000)
    }
  }
}
```

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