The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a7ff7098f0d31bf1afbd3d8119dce389165751d9

commit a7ff7098f0d31bf1afbd3d8119dce389165751d9
Author: Balazs Engedy <engedy@chromium.org>
Date: Mon Jun 04 18:14:47 2018

Introduce AuthenticatorRequestClientDelegate.

AuthenticatorRequestClientDelegate will serve as the primary way of
communication between the AuthenticatorImpl in //content and the
embedder (e.g. //chrome).

It will be used to:

 -- Retrieve contextual information from the embedder required for
    servicing a WebAuthn request. For now, this comprises whether
    direct/individual attestation is allowed, and whether the calling
    frame has focus.

 -- In follow-up CLs, to transmit information back and forth needed
    for showing browser UI during the time of a WebAuthn request,
    e.g. to send the embedder the list of discovered devices.

Bug:  847993 
Change-Id: Ied529aadcc44fbcb5ac2da64743d08e3ddcbba1b
Reviewed-on: https://chromium-review.googlesource.com/1013981
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Reviewed-by: Adam Langley <agl@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564153}
[modify] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/chrome/browser/BUILD.gn
[modify] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/chrome/browser/chrome_content_browser_client.cc
[modify] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/chrome/browser/chrome_content_browser_client.h
[add] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/chrome/browser/webauthn/OWNERS
[add] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/chrome/browser/webauthn/chrome_authenticator_request_delegate.cc
[add] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/chrome/browser/webauthn/chrome_authenticator_request_delegate.h
[modify] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/content/browser/webauth/authenticator_impl.cc
[modify] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/content/browser/webauth/authenticator_impl.h
[modify] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/content/browser/webauth/authenticator_impl_unittest.cc
[modify] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/content/public/browser/BUILD.gn
[add] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/content/public/browser/authenticator_request_client_delegate.cc
[add] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/content/public/browser/authenticator_request_client_delegate.h
[modify] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/content/public/browser/content_browser_client.cc
[modify] https://crrev.com/a7ff7098f0d31bf1afbd3d8119dce389165751d9/content/public/browser/content_browser_client.h