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This CL implements handler for request from authenticator.js
that calculates response for a challenge to perform device
attestation during SAML authentication.

Bug: 1000589
Change-Id: I98ef94c2598fae5a741b7b639b4ede425c913e26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849375Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Michael Ershov <miersh@google.com>
Cr-Commit-Position: refs/heads/master@{#712059}