Re: [fetch] Cache mode: fromCache (#40)

I don't think that the linked use case is all that valid regarding this feature. I'd say this https://github.com/whatwg/fetch/issues/39#issuecomment-140908410 is much more applicable.

Determining whether a resource comes from the cache is an important part of the bandwidth estimation that must be handled when serving adaptive bitrate video content. The `fromCache` attribute would enable more accurate estimation. Currently, this can only be approximated using response timing information.

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https://github.com/whatwg/fetch/issues/40#issuecomment-159269710