Add git-reup and friends

git_squash_branch.py

+#!/usr/bin/env python
+# Copyright 2014 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.
+
+import argparse
+import sys
+
+from git_common import squash_current_branch
+
+def main(args):
+  parser = argparse.ArgumentParser()
+  parser.add_argument(
+      '-m', '--message', metavar='<msg>', default='git squash commit.',
+      help='Use the given <msg> as the first line of the commit message.')
+  opts = parser.parse_args(args)
+  squash_current_branch(opts.message)
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))