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

mojo/tools/roll/roll_network_service.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 argparse
 import os
 import subprocess
 import sys
 import tempfile
 import urllib2
 import zipfile
 
 from update_from_chromium import chromium_rev_number
 from utils import commit
 from utils import mojo_root_dir
 from utils import system
 
-sys.path.insert(0, os.path.join(mojo_root_dir, "tools"))
+sys.path.insert(0, os.path.join(mojo_root_dir, "mojo/public/tools/pylib"))
 # pylint: disable=F0401
 import gs
 
 def roll(target_version):
+  find_depot_tools_path = os.path.join(mojo_root_dir, "tools")
+  sys.path.insert(0, find_depot_tools_path)
+  # pylint: disable=F0401
+  import find_depot_tools
+  depot_tools_path = find_depot_tools.add_depot_tools_to_path()
+
   try:
     chromium_rev = chromium_rev_number(target_version)
   except urllib2.HTTPError:
     print ("Failed to identify a Chromium revision associated with %s. "
            "Ensure that target_version is a Chromium origin/master "
            "commit.") % (target_version)
     return 1
 
   mojoms_gs_path = "gs://mojo/network_service/%s/mojoms.zip" % (target_version,)
   network_service_path = os.path.join(
       mojo_root_dir, "mojo", "services", "network")
   mojoms_path = os.path.join(network_service_path, "public", "interfaces")
   mojo_public_tools_path = os.path.join(
       mojo_root_dir, "mojo", "public", "tools")
   version_path = os.path.join(mojo_public_tools_path, "NETWORK_SERVICE_VERSION")
 
   try:
     with tempfile.NamedTemporaryFile() as temp_zip_file:
-      gs.download_from_public_bucket(mojoms_gs_path, temp_zip_file.name)
+      gs.download_from_public_bucket(mojoms_gs_path, temp_zip_file.name,
+                                     depot_tools_path)
 
       try:
         system(["git", "rm", "-r", mojoms_path], cwd=mojo_root_dir)
       except subprocess.CalledProcessError:
         print ("Could not remove %s. "
                "Ensure your local tree is in a clean state." % mojoms_path)
         return 1
 
       with zipfile.ZipFile(temp_zip_file.name) as z:
         z.extractall(mojoms_path)
@@ skipping 18 matching lines @@
       description="Update the pinned version of the network service " +
                   "and the corresponding checked out mojoms.")
   parser.add_argument("version", help="version to roll to (a Chromium "
                                       "origin/master commit)")
   args = parser.parse_args()
   roll(args.version)
   return 0
 
 if __name__ == "__main__":
   sys.exit(main())