Re: [whatwg/fetch] Double-keyed HTTP cache (#904)

Another question is how we deal with x-origin <link rel=prefetch>. Which cache key does the prefetch use? If it winds up in the prefetching page's cache, it's a waste of network. But how do we know which key should be used?

I know of two options to make x-origin prefetch still work:

1) Allow prefetched resources to be used once within 5 minutes after prefetching, regardless of the cache key. This opens a one-way communication channel between the page that prefetched the resources and the one that consumes them. 

2) Allow prefetched resources to be used once regardless of cache key so long as the page loading the resource was navigated to directly (for some definition of directly) by the page that performed the prefetch. This also forms a one-way communication channel between the page that prefetched and the one that used it, but they had a channel available anyway (link decoration).

/cc @yoavweiss @kinu 

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