Add error information to VerifyCertificateChain().

net/tools/cert_verify_tool/verify_using_path_builder.cc

Index: net/tools/cert_verify_tool/verify_using_path_builder.cc
diff --git a/net/tools/cert_verify_tool/verify_using_path_builder.cc b/net/tools/cert_verify_tool/verify_using_path_builder.cc
index 411e48ae6aea6296caa03a3bd297fe4f51c7371e..2e130f6ec86cdb9c1ba0f4d7d774d82f9b824cea 100644
--- a/net/tools/cert_verify_tool/verify_using_path_builder.cc
+++ b/net/tools/cert_verify_tool/verify_using_path_builder.cc
@@ -197,6 +197,7 @@ bool VerifyUsingPathBuilder(
     DVLOG(1) << "async completed.";
   }
 
+  // TODO(crbug.com/634443): Display the full error information.
   std::cout << "CertPathBuilder best result: "
             << net::ErrorToShortString(result.error()) << "\n";