merge_pr_46182

Add WPTs for ServiceWorker Static Routing API Resource Timing

This CL adds WPTs for Service Worker Static Routing API Resource Timing.
It conducts a set of tests to determine if the resource timing is
correctly working on each source type, and on main and sub-resources.

Explainer: WICG/service-worker-static-routing-api#25
Bug: 41496865
Change-Id: Ide7d352d4824b9491645964febb6522ffe71aafb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5521193
Reviewed-by: Minoru Chikamune chikamune@chromium.org
Reviewed-by: Yoshisato Yanagisawa yyanagisawa@chromium.org
Reviewed-by: Shunya Shishido sisidovski@chromium.org
Reviewed-by: Kent Tamura tkent@chromium.org
Commit-Queue: Keita Suzuki suzukikeita@chromium.org
Cr-Commit-Position: refs/heads/main@{#1303199}