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Adds several user actions for interacting with the site access section
of an extensions setting page, for extensions which requested a list of
specific hosts in their permissions.

For descriptions of each user action, check the changes to actions.xml

Bug: 1102658
Change-Id: I627d91f3166647f4bfc581e8c9ecab96414c04fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2317819
Commit-Queue: Tim Judkins <tjudkins@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802809}