Add error information to VerifyCertificateChain().

net/cert/internal/test_helpers.h

Index: net/cert/internal/test_helpers.h
diff --git a/net/cert/internal/test_helpers.h b/net/cert/internal/test_helpers.h
index 414935b3bd6e8b0dafa081652a5e369d67a8b440..83e823889498350ede5c8ba990d62735b0798d7e 100644
--- a/net/cert/internal/test_helpers.h
+++ b/net/cert/internal/test_helpers.h
@@ -83,7 +83,8 @@ 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);