Change Rietveld.add_comment() to not add the user as a reviewer by default

rietveld.py

 # coding: utf-8
 # Copyright (c) 2012 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.
 """Defines class Rietveld to easily access a rietveld instance.
 
 Security implications:
 
 The following hypothesis are made:
 - Rietveld enforces:
@@ skipping 208 matching lines @@
         svn_props.append((match.group(2), match2.group(1)))
     return svn_props
 
   def update_description(self, issue, description):
     """Sets the description for an issue on Rietveld."""
     logging.info('new description for issue %d' % issue)
     self.post('/%d/description' % issue, [
         ('description', description),
         ('xsrf_token', self.xsrf_token())])
 
-  def add_comment(self, issue, message):
+  def add_comment(self, issue, message, add_as_reviewer=False):
     max_message = 10000
     tail = '…\n(message too large)'
     if len(message) > max_message:
       message = message[:max_message-len(tail)] + tail
     logging.info('issue %d; comment: %s' % (issue, message))
     return self.post('/%d/publish' % issue, [
         ('xsrf_token', self.xsrf_token()),
         ('message', message),
         ('message_only', 'True'),
+        ('add_as_reviewer', str(bool(add_as_reviewer))),
         ('send_mail', 'True'),
         ('no_redirect', 'True')])
 
   def set_flag(self, issue, patchset, flag, value):
     return self.post('/%d/edit_flags' % issue, [
         ('last_patchset', str(patchset)),
         ('xsrf_token', self.xsrf_token()),
         (flag, value)])
 
   def search(
@@ skipping 123 matching lines @@
           if not 'Name or service not known' in e.reason:
             # Usually internal GAE flakiness.
             raise
         # If reaching this line, loop again. Uses a small backoff.
         time.sleep(1+maxtries*2)
     finally:
       upload.ErrorExit = old_error_exit
 
   # DEPRECATED.
   Send = get