I found that I missed a thing during the review of the WPT test for this. The fetch('relevant/test.txt') called from the url-parsing.html can't be intercepted as the client itself is out-of-scope to relevent/test-sw.js. I'll try to fix that.

Also if you didn't start this issue and don't mind, I can work on this while fixing the test. Let me know.

I made a PR to WPT: https://github.com/w3c/web-platform-tests/pull/4805.

FYI: WPT has been imported at https://codereview.chromium.org/2697453005/.

Jungkee: Sure, it would be great if you can fix this.

Sure, I'll take this. Thanks.

 Issue 695831  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/255f7943ef67812af69da392fc5f62cb6f74cf96

commit 255f7943ef67812af69da392fc5f62cb6f74cf96
Author: jungkee.song <jungkee.song@samsung.com>
Date: Sat Feb 25 01:00:33 2017

ServiceWorker: Change base URL for parsing script URL and scope URL

According to the spec change, this changes to use the relevant settings object
instead of the entry settings object to parse the script URL and the scope URL
given to ServiceWorkerContainer.register() and
ServiceWorkerContainer.getRegistration().

Before this CL, register() and getRegistration() used entered execution context
to parse the URLs. After this CL, the methods use the execution context
retrieved from ScriptState::getExecutionContext().

WPT: external/wpt/service-workers/service-worker/multi-globals/url-parsing.https.html

Spec issue: https://github.com/w3c/ServiceWorker/issues/922
Spec change: https://github.com/w3c/ServiceWorker/commit/ec1aac220646a5ea15583e22da1373581a8f2f23

BUG= 691008 

Review-Url: https://codereview.chromium.org/2691903005
Cr-Commit-Position: refs/heads/master@{#453033}

[modify] https://crrev.com/255f7943ef67812af69da392fc5f62cb6f74cf96/third_party/WebKit/LayoutTests/TestExpectations
[delete] https://crrev.com/f40832ec30f1e19f28ca4dfab9e24d608fcefa28/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/controller-on-load.https-expected.txt
[delete] https://crrev.com/f40832ec30f1e19f28ca4dfab9e24d608fcefa28/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/controller-on-reload.https-expected.txt
[modify] https://crrev.com/255f7943ef67812af69da392fc5f62cb6f74cf96/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/controller-on-reload.https.html
[delete] https://crrev.com/f40832ec30f1e19f28ca4dfab9e24d608fcefa28/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/multi-globals/url-parsing.https-expected.txt
[modify] https://crrev.com/255f7943ef67812af69da392fc5f62cb6f74cf96/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/multiple-register.https.html
[modify] https://crrev.com/255f7943ef67812af69da392fc5f62cb6f74cf96/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/registration-iframe.https.html
[modify] https://crrev.com/255f7943ef67812af69da392fc5f62cb6f74cf96/third_party/WebKit/LayoutTests/http/tests/background_sync/oneshot.html
[modify] https://crrev.com/255f7943ef67812af69da392fc5f62cb6f74cf96/third_party/WebKit/LayoutTests/http/tests/serviceworker/controller-on-reload.html
[delete] https://crrev.com/f40832ec30f1e19f28ca4dfab9e24d608fcefa28/third_party/WebKit/LayoutTests/http/tests/serviceworker/registration-iframe.html
[modify] https://crrev.com/255f7943ef67812af69da392fc5f62cb6f74cf96/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
[modify] https://crrev.com/255f7943ef67812af69da392fc5f62cb6f74cf96/third_party/WebKit/Source/bindings/core/v8/V8Binding.h
[modify] https://crrev.com/255f7943ef67812af69da392fc5f62cb6f74cf96/third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerContainer.cpp

Fixed in M58.