Add error information to VerifyCertificateChain().

net/cert/internal/test_helpers.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_CERT_INTERNAL_TEST_HELPERS_H_
 #define NET_CERT_INTERNAL_TEST_HELPERS_H_
 
 #include <stddef.h>
 
 #include <ostream>
@@ skipping 65 matching lines @@
   return ReadTestDataFromPemFile(file_path_ascii, mappings, N);
 }
 
 // Reads a test case from |file_name|. Test cases are comprised of a
 // certificate chain, trust anchor, a timestamp to validate at, and the
 // expected result of verification.
 void ReadVerifyCertChainTestFromFile(const std::string& file_name,
                                      ParsedCertificateList* chain,
                                      scoped_refptr<TrustAnchor>* trust_anchor,
                                      der::GeneralizedTime* time,
-                                     bool* verify_result);
+                                     bool* verify_result,
+                                     std::string* expected_errors);
 
 // Reads a data file relative to the src root directory.
 std::string ReadTestFileToString(const std::string& file_name);
 
 }  // namespace net
 
 #endif  // NET_CERT_INTERNAL_TEST_HELPERS_H_