Re: [ServiceWorker] Support restarting download when storing large resources in Cache (#713)

```
cache.backgroundDownloadThisPlease(request);
```

Is this the same thing as background sync?

What about something like `cache.append(request, response)` which does a match on request, then appends response to its body.  It would reject if the headers don't match, isn't a range request, etc.  This could also allow the status code to be updated from 206.  Just a thought.

Alternatively, we could do nothing and make the SW do the merging in script.  Once Streams is more widely available this could be done in a memory efficient way.  It would just be a fair amount of boilerplate to write.  Match all your partial responses, create a new response with a pipe body, and then concat the partial responses into the new pipe.

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