GitLab

This class maintains an index of all registered service workers by
origin, querying the whole list on startup and observering additional
registrations during the browsing session.

This class is owned by IsolatedPrerenderService but isn't wired into
the triggering logic, yet.

Bug: 1023486
Change-Id: I077512366b85ebe20e87fe14bf2ea9088d611820
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031527Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737347}