Chrome OS quick unlock: Add support for First run UI


This CL adds required changes to quick_unlock code to allow further integration
into First run UI.

Bug: 852553
Change-Id: Ica3a431c1c24d3f6c658695c8c333a11f528245a
Reviewed-on: https://chromium-review.googlesource.com/c/1247261
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599011}
8 files changed