GitLab

This CL adds some basic fingerprint UI to views lock screen to support
fingerprint fishfood.
The detailed specs are not ready and may be subject to change. So it
may need to be polished in the future for adding animation, adjusting
styles etc.

Current mocks:
https://gallery.googleplex.com/projects/MCHbtQVoQ2HCZdwfnbqy2eSi/files/MCHm5Lyh8lQ6SZ3vjzwd3Uo8wMSJbxAVNpw

Bug: 835357
Change-Id: Ifab074ca53bb0a8a5128d9b3da6139d68bb03b09
Reviewed-on: https://chromium-review.googlesource.com/1047958Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Xiaoyin Hu <xiaoyinh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557254}