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Add notification UI to SecurityTokenSessionController. These
notifications appear the first time a user was logged out / their
session was locked because of the SecurityTokenSessionBehavior policy.

A profile pref is used to save whether a user has already seen such a
notification once. If the session is locked, the controller creates
the notification directly. If the user is logged out, a local state pref
is used to schedule the creation of the notification.

Bug: 1131450
Change-Id: I27da14ec8d7a2fed53c46764ef64d156f399e86d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505877Reviewed-by: Dominic Battré <battre@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Fabian Sommer <fabiansommer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827777}