Add trivial git-bash so that it can always drop you into a bash term,

even on windows.

R=mattm@chromium.org, mmoss@chromium.org, vadimsh@chromium.org
BUG=345142

Review URL: https://codereview.chromium.org/1496343003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@297854 0039d316-1c4b-4281-b951-d872f2087c98

git-bash

+#!/usr/bin/env bash
+# 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.
+
+# This apparently useless file enables windows users to get access to
+# depot_tools' built-in bash.exe. When git executes this file as in `git bash`,
+# it has bash and related tools pre-installed in the environment. Therefore even
+# though 'bash' from cmd.exe doesn't work, bash here does work as you'd expect.
+
+bash "$@"