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Added classes to encapsulate response data received from CTAP
devices as specified by the CTAP protocol.

https://fidoalliance.org/specs/fido-v2.0-rd-20170927/fido-client-to-authenticator-protocol-v2.0-rd-20170927.html#authenticatorMakeCredential

Bug: 796782
Change-Id: If5a80846d565ab6a7919aa3236ff78e22b5209ae
Reviewed-on: https://chromium-review.googlesource.com/850895
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531932}