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This patch adds the infrastructure necessary to display a sign-in
notification following a Gaia cookie restoration event.

Bug: 1145592
Change-Id: Ibbc704a3043ffc8c896e604fd319281100e3149a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519457
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824092}