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This adds views for setting up a PIN and challenging a PIN during a
WebAuthn request. Nothing wired up into //device/fido yet.

TBR=oshima@chromium.org

Change-Id: I009986e65ae38d50908d5bdfb993885489d1c0d8
Reviewed-on: https://chromium-review.googlesource.com/c/1462423
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Adam Langley <agl@chromium.org>
Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632043}