The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a9abd0dbbd53d26af345e566a308051bf8843430

commit a9abd0dbbd53d26af345e566a308051bf8843430
Author: Martin Kreichgauer <martinkr@chromium.org>
Date: Thu Jan 17 01:21:28 2019

fido: only request direct attestation from Windows when necessary

The WinWebAuthnApiAuthenticator currently always requests DIRECT attestation
from the Windows WebAuthn API and relies on AuthenticatorImpl to strip the
attestation statement later if necessary. This changes the behavior to only
request attestation when actually requested by the RP in order to avoid
unneccessarily generating an attestation signature in cases where that is
computationally expensive.

Bug:  921155 
Change-Id: I2f39f5e85ea2be56cff1df87bc5464374dabf911
Reviewed-on: https://chromium-review.googlesource.com/c/1414310
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Adam Langley <agl@chromium.org>
Commit-Queue: Martin Kreichgauer <martinkr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623497}
[modify] https://crrev.com/a9abd0dbbd53d26af345e566a308051bf8843430/content/browser/webauth/authenticator_impl.cc
[modify] https://crrev.com/a9abd0dbbd53d26af345e566a308051bf8843430/content/browser/webauth/authenticator_impl.h
[modify] https://crrev.com/a9abd0dbbd53d26af345e566a308051bf8843430/content/browser/webauth/authenticator_type_converters.cc
[modify] https://crrev.com/a9abd0dbbd53d26af345e566a308051bf8843430/content/browser/webauth/authenticator_type_converters.h
[modify] https://crrev.com/a9abd0dbbd53d26af345e566a308051bf8843430/device/fido/ctap_make_credential_request.cc
[modify] https://crrev.com/a9abd0dbbd53d26af345e566a308051bf8843430/device/fido/ctap_make_credential_request.h
[modify] https://crrev.com/a9abd0dbbd53d26af345e566a308051bf8843430/device/fido/fido_constants.h
[modify] https://crrev.com/a9abd0dbbd53d26af345e566a308051bf8843430/device/fido/u2f_command_constructor.cc
[modify] https://crrev.com/a9abd0dbbd53d26af345e566a308051bf8843430/device/fido/u2f_register_operation_unittest.cc
[modify] https://crrev.com/a9abd0dbbd53d26af345e566a308051bf8843430/device/fido/win/authenticator.cc
[modify] https://crrev.com/a9abd0dbbd53d26af345e566a308051bf8843430/device/fido/win/type_conversions.cc
[modify] https://crrev.com/a9abd0dbbd53d26af345e566a308051bf8843430/device/fido/win/type_conversions.h