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Also added strings and image for fingerprint unlock UI.

Bug: 835357
Change-Id: I8b7f1de78121cdef8b831f1fe2373674705cee7b
Reviewed-on: https://chromium-review.googlesource.com/1157064
Commit-Queue: Xiaoyin Hu <xiaoyinh@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579575}