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This CL implements javascript part of code that allows to
perform device attestation during SAML authentication and
adds browser tests for that.

Bug: 1000589
Test: SAMLDeviceAttestationTest.*
Change-Id: I88829456242c59a5d98293188890e4faed03574d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1848374Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Michael Ershov <miersh@google.com>
Cr-Commit-Position: refs/heads/master@{#713083}