Add SW static routing API timing information to resource timing

[quasi-mod]

This PR adds the resource timing spec changes for Timing information for SW static routing API.
Explainer here: https://github.com/WICG/service-worker-static-routing-api/blob/main/resource-timing-api.md

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Preview | Diff

[quasi-mod]

This is still a draft PR.
@yoshisatoyanagisawa @domenic @sisidovski, could you take a look to see if this make sense?

[quasi-mod]

I've updated this PR. The fetch-side of change (whatwg/fetch#1832) needs a bit more work (specifically around getting signals), but I think the resource timing side of change is ready to be looked.

Let me ask @yoavweiss for opinions and reviews.

[yoavweiss]

The resource-timing parts look good, but I suspect most of the subtleties will be on the Fetch side..

[quasi-mod]

The fetch-side specs are finally settled. (whatwg/fetch#1832)
@yoavweiss , could you recheck and see if this change still makes sense?
Thanks!

[yoshisatoyanagisawa]

non-owner lgtm.

[yoavweiss]

The fetch-side specs are finally settled. (whatwg/fetch#1832)
@yoavweiss , could you recheck and see if this change still makes sense?
Thanks!

Is it possible to land the fetch-side PR first?

[quasi-mod]

Thanks, the fetch PR had just been merged

[quasi-mod]

Fixed the CI issue. PTAL again. Thanks!

[yoavweiss]

LGTM

[quasi-mod]

Thanks for the review!
@yoavweiss Unfortunately, I do not have merge permission, so it would be great if you could merge the changes.