Add error details to ParseCertificate test data.

net/data/verify_certificate_chain_unittest/rebase-errors.py

 #!/usr/bin/python
 # Copyright (c) 2016 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.
 
 """Helper script to update the test error expectations based on actual results.
 
 This is useful for regenerating test expectations after making changes to the
 error format.
 
@@ skipping 70 matching lines @@
 
 
 def fixup_pem_file(path, actual_errors):
   """Updates the ERRORS block in the test .pem file"""
   contents = read_file_to_string(path)
 
   prog = re.compile(kErrorsBlockPattern, re.MULTILINE | re.DOTALL)
   m = prog.search(contents)
 
   if not m:
-    print "Couldn't find ERRORS block in %s" % (path)
-    return
-
-  contents = replace_string(contents, m.start(1), m.end(1),
-                            common.text_data_to_pem('ERRORS', actual_errors))
+    contents += '\n' + common.text_data_to_pem('ERRORS', actual_errors)
+  else:
+    contents = replace_string(contents, m.start(1), m.end(1),
+                              common.text_data_to_pem('ERRORS', actual_errors))
 
   # Update the file.
   write_string_to_file(contents, path)
 
 
 def fixup_py_file(path, actual_errors):
   """Replaces the 'errors = XXX' section of the test's python script"""
   contents = read_file_to_string(path)
 
   # This assumes that the errors variable uses triple quotes.
@@ skipping 51 matching lines @@
 
   for m in prog.finditer(test_stdout):
     actual_errors = m.group(1)
     actual_errors = actual_errors.decode('string-escape')
     relative_test_path = m.group(2)
     fixup_errors_for_file(actual_errors, get_abs_path(relative_test_path))
 
 
 if __name__ == "__main__":
   main()