Use find_depot_tools.py and vs_toolchain.py from chromium/src/build/

build/find_depot_tools.py

-#!/usr/bin/python
-# Copyright (c) 2011 The Native Client Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-"""Small utility to find depot_tools."""
-
-import os
-import sys
-
-
-def _IsRealDepotTools(path):
-  return os.path.isfile(os.path.join(path, 'gclient'))
-
-
-def FindDepotTools():
-  """Search for depot_tools and return its path."""
-  # First look if depot_tools is already in PYTHONPATH.
-  for i in sys.path:
-    if i.rstrip(os.sep).endswith('depot_tools') and _IsRealDepotTools(i):
-      return i
-  # Then look if depot_tools is in PATH, common case.
-  for i in os.environ['PATH'].split(os.pathsep):
-    if _IsRealDepotTools(i):
-      return i.rstrip(os.sep)
-  # Rare case, it's not even in PATH, look upward up to root.
-  root_dir = os.path.dirname(os.path.abspath(__file__))
-  previous_dir = os.path.abspath(__file__)
-  while root_dir and root_dir != previous_dir:
-    i = os.path.join(root_dir, 'depot_tools')
-    if _IsRealDepotTools(i):
-      return i
-    previous_dir = root_dir
-    root_dir = os.path.dirname(root_dir)
-  return None
-
-
-def main():
-  path = FindDepotTools()
-  if not path:
-    print >> sys.stderr, 'Failed to find depot_tools'
-    return 1
-  print path
-  return 0
-
-
-if __name__ == '__main__':
-  sys.exit(main())