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Add Polymer template for the views in login flow, component
for buttons and CSS.

See http://doc/1WVGl7i7uWTnMEa3MPPVALegDM-7RabDv6z3JrAw53Sg

Bug: 1043108
Change-Id: I70d4a1e75e3cdf8889ce211eacb7946db09cba9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2007455
Commit-Queue: Anastasiia Nikolaienko <anastasiian@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Kush Sinha <sinhak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747203}