Re: [slightlyoff/ServiceWorker] Enabling multiple Service Workers for a single scope (#921)

@wanderview overriding `self.fetch` and `self.caches` can probably satisfy the basic "lower layer interception" use-case, so it might be good enough for what I'm trying to do. (aside: isn't `XMLHTTPRequest` unavailable from a SW context?)

It does add complexity (as the code would need to be significantly different if the site has a SW or not, and I'd have to make sure that the overriding happens before the site's SW is run), and I'm having a hard time figuring out how/if a similar model can be used to receive push notifications. (I see how I can intercept them by creating wrappers around the entire SW registration process, which seems be a bit much)

Also, IIUC, I'd have to override these values on each `fetch` call, as I can't rely on the SW state to remain intact between events. Is that correct?

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