Add git-number script to calculate generation numbers for commits.

git-number

 #!/bin/sh
-# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Copyright (c) 2013 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.
 
-# git-cl -- a git-command for integrating reviews on Rietveld
-# Copyright (C) 2008 Evan Martin <martine@danga.com>
+# git-number -- a git-command for calculating and displaying the generation
+# number of a commit.
 
 # Test if this script is running under a MSys install.  If it is, we will
 # hardcode the path to Python where possible.
 OUTPUT="$(uname | grep 'MINGW')"
 MINGW=$?
 
 if [ $MINGW = 0 ]; then
   base_dir="${0%\\*}"
 else
   base_dir=$(dirname "$0")
 fi
 
 # Uncomment this line if you never use gclient.
 # "$base_dir"/update_depot_tools
 
 if [ -e "$base_dir/python.bat" -a $MINGW = 0 ]; then
-  PYTHONDONTWRITEBYTECODE=1 cmd.exe //c "$base_dir\\python.bat" "$base_dir\\git_cl.py" "$@"
+  PYTHONDONTWRITEBYTECODE=1 cmd.exe //c "$base_dir\\python.bat" "$base_dir\\git_number.py" "$@"
 else
-  PYTHONDONTWRITEBYTECODE=1 exec "$base_dir/git_cl.py" "$@"
+  PYTHONDONTWRITEBYTECODE=1 exec "$base_dir/git_number.py" "$@"
 fi