[whatwg/fetch] Return a "controller" instance from fetch (#1329)

Use the controller for external timing reporting and aborts.

This allows removing the 1:1 dependency between timing info and a response, as a response can be shared across fetch
instances (e.g. when restoring a response from cache, or when forwarding a response through a service worker).

See https://github.com/whatwg/fetch/issues/1208


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(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1329


-- Commit Summary --

  * <a href="https://github.com/whatwg/fetch/pull/1329/commits/c9efcbed27bffb068ea4025474fc1171c981198b">Return a &quot;controller&quot; instance from fetch</a>

-- File Changes --

    M fetch.bs (51)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1329.patch

https://github.com/whatwg/fetch/pull/1329.diff


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