gtk: Certificate viewer should show both A-label and U-label for CN and SubjectAltName IDNs

chrome/third_party/mozilla_security_manager/nsNSSCertHelper.h

 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
  *
  * Software distributed under the License is distributed on an "AS IS" basis,
  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
@@ skipping 63 matching lines @@
 extern SECOidTag ms_ntds_replication;
 
 void RegisterDynamicOids();
 
 // Format a SECItem as a space separated string, with 16 bytes on each line.
 std::string ProcessRawBytes(SECItem* data);
 
 // For fields which have the length specified in bits, rather than bytes.
 std::string ProcessRawBits(SECItem* data);
 
+// For host values, if they contain IDN Punycode-encoded A-labels, this will
+// return a string suitable for display that contains both the original and the
+// decoded U-label form.  Otherwise, the string will be returned as is.
+std::string ProcessIDN(const std::string& input);
+
 std::string DumpOidString(SECItem* oid);
 std::string GetOIDText(SECItem* oid);
 
 std::string ProcessRDN(CERTRDN* rdn);
 std::string ProcessName(CERTName* name);
 std::string ProcessBasicConstraints(SECItem* extension_data);
 std::string ProcessGeneralName(PRArenaPool* arena,
                                CERTGeneralName* current);
 std::string ProcessGeneralNames(PRArenaPool* arena,
                                 CERTGeneralName* name_list);
 std::string ProcessAltName(SECItem* extension_data);
 std::string ProcessSubjectKeyId(SECItem* extension_data);
 std::string ProcessAuthKeyId(SECItem* extension_data);
 std::string ProcessCrlDistPoints(SECItem* extension_data);
 std::string ProcessAuthInfoAccess(SECItem* extension_data);
 std::string ProcessIA5String(SECItem* extension_data);
 std::string ProcessBMPString(SECItem* extension_data);
 std::string ProcessNSCertTypeExtension(SECItem* extension_data);
 std::string ProcessKeyUsageBitString(SECItem* bitstring, char sep);
 std::string ProcessKeyUsageExtension(SECItem* extension_data);
 std::string ProcessExtKeyUsage(SECItem* extension_data);
 std::string ProcessExtensionData(SECOidTag oid_tag, SECItem* extension_data);
 std::string ProcessSubjectPublicKeyInfo(CERTSubjectPublicKeyInfo* spki);
 
 CertType GetCertType(CERTCertificate *cert);
 
 }  // namespace mozilla_security_manager
 
 #endif  // CHROME_THIRD_PARTY_MOZILLA_SECURITY_MANAGER_NSNSSCERTHELPER_H_