Reland "Fetch: Plumb request initiator through passthrough service workers."

[chromium-wpt-export-bot]

This is a reland of da0a6501cf321579bd46a27ff9fba1bb8ea910bb

This CL also includes a change to mark the two WPT tests as requiring
long timeout durations. On my fast build machine with an opt build
they take ~5 seconds each to complete and the default timeout is 10
seconds. On slower bots with debug builds its highly likely that these
tests would be marked as timing out. This change gives them a 60 second
timeout instead.

Original change's description:

Fetch: Plumb request initiator through passthrough service workers.

This CL contains essentially two changes:

1. The request initiator origin is plumbed through service workers
   that do fetch(evt.request). In addition to plumbing, this
   requires changes to how we validate navigation requests in the
   CorsURLLoaderFactory.
2. Tracks the original destination of a request passed through a
   service worker. This is then used in the network service to force
   SameSite=Lax cookies to treat the request as a main frame navigation
   where appropriate.

For more detailed information about these changes please see the
internal design doc at:

https://docs.google.com/document/d/1KZscujuV7bCFEnzJW-0DaCPU-I40RJimQKoCcI0umTQ/edit?usp=sharing

In addition, there is some discussion of these features in the following
spec issues:

whatwg/fetch#1321
whatwg/fetch#1327

The test includes WPT tests that verify navigation headers and SameSite
cookies. Note, chrome has a couple expected failures in the SameSite
cookie tests because of the "lax-allowing-unsafe" intervention that is
currently enabled. See:

https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/web_tests/TestExpectations;l=4635;drc=e8133cbf2469adb99c6610483ab78bcfb8cc4c76

Bug: 1115847,1241188
Change-Id: I7e236fa20aeabb705aef40fcf8d5c36da6d2798c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3115917
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/main@{#936029}

Bug: 1115847,1241188
Change-Id: Ia26acbdd0d7ce6583d9a44f83ed086708657b8bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3251368
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Auto-Submit: Ben Kelly <wanderview@chromium.org>
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/main@{#936560}

[wpt-pr-bot]

The review process for this patch is being conducted in the Chromium project.