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When a service worker intercepts a page that is later registered as a
handler for a custom scheme via navigator.registerProtocolHandler, and
if one clicks a link with this custom scheme, then the service worker
is only able to intercept the page after reload. This CL fixes that
bug by allowing the service worker to intercept the page after
registering the custom scheme.

A new browser unit test is added to verify this fix. This also makes
the following manual WPT tests pass (*):
  protocol-handler-fragment-manual.https.html
  protocol-handler-path-manual.https.html
  protocol-handler-query-manual.https.html

(*) https://w3c-test.org/html/webappapis/system-state-and-capabilities/the-navigator-object/

Bug: 522370
Change-Id: I95eda9025885838665e9735ac9f47a3d65d89aa8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379672
Commit-Queue: Frédéric Wang <fwang@igalia.com>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818416}