Add error information to VerifyCertificateChain().

net/data/verify_certificate_chain_unittest/common.py

Index: net/data/verify_certificate_chain_unittest/common.py
diff --git a/net/data/verify_certificate_chain_unittest/common.py b/net/data/verify_certificate_chain_unittest/common.py
index b21e2a9c806f190a0d841d8a170e7c59e2f8e6d2..d0f16c4e46af7407d9b8dbe40f547175ba8de632 100755
--- a/net/data/verify_certificate_chain_unittest/common.py
+++ b/net/data/verify_certificate_chain_unittest/common.py
@@ -436,7 +436,7 @@ class TrustAnchor(object):
 
 
 def write_test_file(description, chain, trust_anchor, utc_time, verify_result,
-                    out_pem=None):
+                    errors, out_pem=None):
   """Writes a test file that contains all the inputs necessary to run a
   verification on a certificate chain"""
 
@@ -453,6 +453,9 @@ def write_test_file(description, chain, trust_anchor, utc_time, verify_result,
   verify_result_string = 'SUCCESS' if verify_result else 'FAIL'
   test_data += '\n' + data_to_pem('VERIFY_RESULT', verify_result_string)
 
+  if errors is not None:
+    test_data += '\n' + data_to_pem('ERRORS', '\n'.join(errors))
+
   write_string_to_file(test_data, out_pem if out_pem else g_out_pem)