Add *.tac to git-gs.

.tac files are used for twisted applications, like buildbot.

R=dpranke@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/8501022

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@109238 0039d316-1c4b-4281-b951-d872f2087c98

git-gs

 #!/bin/sh
-# Copyright (c) 2010 The Chromium Authors. All rights reserved.
+# Copyright (c) 2011 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 grep -n -e "$@" -- "*.h" "*.hpp" "*.cpp" "*.c" "*.cc" "*.cpp" "*.inl"\
-   "*.grd" "*.idl" "*.m" "*.mm" "*.py" "*.sh" "*.cfg"\
+   "*.grd" "*.idl" "*.m" "*.mm" "*.py" "*.sh" "*.cfg" "*.tac"\
    "*SConscript" "SConscript*" "*.scons" "*.vcproj" "*.vsprops" "*.make"\
    "*.gyp" "*.gypi" "*.js" "*.html" "*.css"
-