[Autofill Auth] Attestation conveyance set by Payments Server

The attestation conveyance preference will be set by Payments Server, and will
fallback to 'none' if field was empty.

Bug: 949269
Change-Id: Ib531f6380882f495bbb098d37127d6a92b4b7ac1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895329Reviewed-by: Jared Saul <jsaul@google.com>
Commit-Queue: Manas Verma <manasverma@google.com>
Cr-Commit-Position: refs/heads/master@{#712758}

components/autofill/core/browser/payments/credit_card_fido_authenticator.cc

@@ -525,7 +525,18 @@ CreditCardFIDOAuthenticator::ParseCreationOptions(
       "timeout_millis", base::Value::Type::INTEGER);
   options->adjusted_timeout = base::TimeDelta::FromMilliseconds(
       timeout ? timeout->GetInt() : kWebAuthnTimeoutMs);
+
+  const auto* attestation =
+      creation_options.FindStringKey("attestation_conveyance_preference");
+  if (!attestation || base::EqualsCaseInsensitiveASCII(*attestation, "NONE")) {
+    options->attestation = AttestationConveyancePreference::kNone;
+  } else if (base::EqualsCaseInsensitiveASCII(*attestation, "INDIRECT")) {
+    options->attestation = AttestationConveyancePreference::kIndirect;
+  } else if (base::EqualsCaseInsensitiveASCII(*attestation, "DIRECT")) {
     options->attestation = AttestationConveyancePreference::kDirect;
+  } else {
+    NOTREACHED();
+  }
 
   // Only allow user-verifying platform authenticators.
   options->authenticator_selection = AuthenticatorSelectionCriteria(