diff -r 000000000000 -r 6474c204b198 media/webrtc/trunk/build/win/setup_cygwin_mount.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/media/webrtc/trunk/build/win/setup_cygwin_mount.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+# Copyright (c) 2012 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 sys
+
+def main():
+  if len(sys.argv) != 2 or sys.argv[1] != '--win-only':
+    return 1
+  if sys.platform in ('win32', 'cygwin'):
+    self_dir = os.path.dirname(sys.argv[0])
+    mount_path = os.path.join(self_dir, "../../third_party/cygwin")
+    batch_path = os.path.join(mount_path, "setup_mount.bat")
+    return os.system(os.path.normpath(batch_path) + ">nul")
+  return 0
+
+
+if __name__ == "__main__":
+  sys.exit(main())