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Adding a key to cryptohome requires the associated UserContext. This
adds an AuthToken to quick_unlock which stores the UserContext
instance. The AuthToken automatically expires after a delay.

Bug: 623344
Change-Id: Ife3373599fb560dfe9f9055fcda54a9f001c6ac7
Reviewed-on: https://chromium-review.googlesource.com/980738
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547785}