Re: [ServiceWorker] Prefetch/prerender & Client id (#210)

@annevk +1. We should report "prerender" context on any fetch that was initiated by `<link rel=prerender>`, and subsequent fetches that may be triggered by the prerendered resource itself should advertise the context that triggered it... e.g. HTML request for a prerender has the context of "prerender", but script/style/image/etc fetches initiated during prerendering should advertise their usual contexts.

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