device/fido: Set user display name for ChromeOSAuthenticator

The user display name will be used to managed credentials.

Bug: 1150639
Change-Id: Ie7137255cc3e5450f71e0b74e56f8cfca5390860
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547625
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#829035}

device/fido/cros/authenticator.cc

@@ -98,6 +98,8 @@ void ChromeOSAuthenticator::MakeCredential(CtapMakeCredentialRequest request,
   req.set_rp_id(request.rp.id);
   req.set_user_id(
       std::string(request.user.id.begin(), request.user.id.end()));
+  if (request.user.display_name.has_value())
+    req.set_user_display_name(request.user.display_name.value());
   req.set_resident_credential(request.resident_key_required);
   DCHECK(generate_request_id_callback_);
   req.set_request_id(generate_request_id_callback_.Run());