Add missing files for PNaCl.

collate.py

+#!/usr/bin/python
+# Copyright (c) 2013 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.
+
+# Runs a subprocess (command and args taken from argv), and collates
+# its output to stdout such that the subprocess's stdout is printed
+# followed by its stderr.  This matches the collation in
+# native_client/run.py so that PNaCl and native output can be compared
+# accurately.
+
+import subprocess
+import sys
+
+def main(argv):
+  p = subprocess.Popen(argv[1:], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+  (stdout_contents, stderr_contents) = p.communicate()
+  sys.stdout.write((stdout_contents or '') + (stderr_contents or ''))
+  return p.returncode
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))