GN: Strip NaCl IRT and save its .debug file

ppapi/native_client/irt_debuglink.py

+#!/usr/bin/env python
+# Copyright (c) 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.
+
+"""Run objcopy --add-gnu-debuglink for the NaCl IRT.
+"""
+
+import subprocess
+import sys
+
+
+def Main(args):
+  objcopy, debug_file, stripped_file, output_file = args
+  return subprocess.call([
+      objcopy, '--add-gnu-debuglink', debug_file, stripped_file, output_file
+      ])
+
+
+if __name__ == '__main__':
+  sys.exit(Main(sys.argv[1:]))