Move //tools/gs.py into //mojo/public/tools

mojo/public/tools/pylib/gs.py

-#!/usr/bin/env python
 # Copyright 2015 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 os
 import subprocess
 import sys
-import find_depot_tools
 
-def download_from_public_bucket(gs_path, output_path):
-  depot_tools_path = find_depot_tools.add_depot_tools_to_path()
+def download_from_public_bucket(gs_path, output_path, depot_tools_path):
   gsutil_exe = os.path.join(depot_tools_path, "third_party", "gsutil", "gsutil")
 
   # We're downloading from a public bucket which does not need authentication,
   # but the user might have busted credential files somewhere such as ~/.boto
   # that the gsutil script will try (and fail) to use. Setting these
   # environment variables convinces gsutil not to attempt to use these, but
   # also generates a useless warning about failing to load the file. We want
   # to discard this warning but still preserve all output in the case of an
   # actual failure. So, we run the script and capture all output and then
   # throw the output away if the script succeeds (return code 0).
   env = os.environ.copy()
   env["AWS_CREDENTIAL_FILE"] = ""
   env["BOTO_CONFIG"] = ""
   try:
     subprocess.check_output(
         [gsutil_exe,
          "--bypass_prodaccess",
          "cp",
          gs_path,
          output_path],
         stderr=subprocess.STDOUT,
         env=env)
   except subprocess.CalledProcessError as e:
     print e.output
     sys.exit(1)