Create "git cache" command.

git-cache

Index: git-cache
diff --git a/git-number b/git-cache
similarity index 69%
copy from git-number
copy to git-cache
index 6c06f055de9e284026ea8d8485627d76bd832478..14ffa60b9e14ffc0146a23a2a55fd72b7a158995 100755
--- a/git-number
+++ b/git-cache
@@ -1,10 +1,9 @@
 #!/bin/sh
-# Copyright 2013 The Chromium Authors. All rights reserved.
+# 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.
 
-# git-number -- a git-command for calculating and displaying the generation
-# number of a commit.
+# git-cache -- a git-command for managing local caches of remote repositories.
 
 # Test if this script is running under a MSys install.  If it is, we will
 # hardcode the path to Python where possible.
@@ -21,7 +20,7 @@ fi
 # "$base_dir"/update_depot_tools
 
 if [ -e "$base_dir/python.bat" -a $MINGW = 0 ]; then
-  PYTHONDONTWRITEBYTECODE=1 cmd.exe //c "$base_dir\\python.bat" "$base_dir\\git_number.py" "$@"
+  PYTHONDONTWRITEBYTECODE=1 cmd.exe //c "$base_dir\\python.bat" "$base_dir\\git_cache.py" "$@"
 else
-  PYTHONDONTWRITEBYTECODE=1 exec "$base_dir/git_number.py" "$@"
+  PYTHONDONTWRITEBYTECODE=1 exec "$base_dir/git_cache.py" "$@"
 fi