Re: [ServiceWorker] Can create caches in the persistent storage? (#803)

The idea is to use the storage spec to request persistence:

  https://storage.spec.whatwg.org/

We don't implement this in gecko yet, but I thought I saw some blink intent emails for this API.

There is still debate about whether to do something like the `beforeevicted` event or provide a storage API for controlling eviction.  In gecko we strongly prefer something through the storage API and not an event like `beforeevicted`.

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