[whatwg/fetch] Add steps to intercept requests using foreign fetch. (#329)

If response is still null after a regular service worker has tried handling it
this gives a foreign fetch handler a chance to handle the request.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/329

-- Commit Summary --

  * Add steps to intercept requests using foreign fetch.

-- File Changes --

    M Overview.src.html (42)

-- Patch Links --

https://github.com/whatwg/fetch/pull/329.patch
https://github.com/whatwg/fetch/pull/329.diff

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