[Origin Trials] Support updates of disabled token list

tools/origin_trials/generate_token.py

 #!/usr/bin/env 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.
 
 """Utility for generating experimental API tokens
 
 usage: generate_token.py [-h] [--key-file KEY_FILE]
                          [--expire-days EXPIRE_DAYS |
                           --expire-timestamp EXPIRE_TIMESTAMP]
@@ skipping 162 matching lines @@
     sys.exit(1)
 
 
   # Output the token details
   print "Token details:"
   print " Origin: %s" % args.origin
   print " Is Subdomain: %s" % args.is_subdomain
   print " Feature: %s" % args.trial_name
   print " Expiry: %d (%s UTC)" % (expiry, datetime.utcfromtimestamp(expiry))
   print " Signature: %s" % ", ".join('0x%02x' % ord(x) for x in signature)
+  print " Signature (Base64): %s" % base64.b64encode(signature)
   print
 
   # Output the properly-formatted token.
   print FormatToken(VERSION, signature, token_data)
 
 if __name__ == "__main__":
   main()