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Users who log in with a security token (smart card) can be required to
keep their smart card inserted at all times. If they remove their smart
card, they are logged out or the session will be locked. This behavior
is controlled by two policies SecurityTokenSessionBehavior and
SecurityTokenSessionNotificationSeconds.

This CL adds UI for this: A notification that informs the user they are
about to be logged out unless they re-insert their smart card.

The UI will be wired up with the controller for this behavior in a
follow-up CL.

Bug: 1131450
Change-Id: Ifc16c5720ab8da4b5a1678db6d06ed8ce321dc57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480082Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Nancy Wang <nancylingwang@chromium.org>
Commit-Queue: Fabian Sommer <fabiansommer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825327}