add --force option for presubmit command

trychange.py

 #!/usr/bin/env python
 # 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.
 
 """Client-side script to send a try job to the try server. It communicates to
 the try server by either writting to a svn repository or by directly connecting
 to the server by HTTP.
 """
 
@@ skipping 801 matching lines @@
                                             changed_files,
                                             options.issue,
                                             options.patchset,
                                             options.email)
         options.bot = presubmit_support.DoGetTrySlaves(
             change,
             checkouts[0].GetFileNames(),
             checkouts[0].checkout_root,
             root_presubmit,
             options.project,
-            False,
+            options.verbose,
             sys.stdout)
       except ImportError:
         pass
       if options.testfilter:
         bots = set()
         for bot in options.bot:
           assert ',' not in bot
           if bot.endswith(':compile'):
             # Skip over compile-only builders for now.
             continue
@@ skipping 33 matching lines @@
     return 1
   except (gclient_utils.Error, subprocess2.CalledProcessError), e:
     print >> sys.stderr, e
     return 1
   return 0
 
 
 if __name__ == "__main__":
   fix_encoding.fix_encoding()
   sys.exit(TryChange(None, None, False))