Basic standalone GN configs.

gn.py

Index: gn.py
diff --git a/gn.py b/gn.py
deleted file mode 100755
index b17280a1b125779af2f178e7653242a469a5eafb..0000000000000000000000000000000000000000
--- a/gn.py
+++ /dev/null
@@ -1,37 +0,0 @@
-#!/usr/bin/env python
-
-# Copyright 2016 Google Inc.
-#
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import subprocess
-import sys
-
-def quiet(*cmd):
-  cmd = ' '.join(cmd).split()
-  subprocess.check_output(cmd)
-
-def loud(*cmd):
-  cmd = ' '.join(cmd).split()
-  ret = subprocess.call(cmd)
-  if ret != 0:
-    sys.exit(ret)
-
-def gn_path():
-  if 'linux' in sys.platform:
-    return 'buildtools/linux64/gn'
-  if 'darwin' in sys.platform:
-    return 'buildtools/mac/gn'
-  return 'buildtools/win/gn.exe'
-
-# Make sure we've got an up-to-date GN and Clang, and sysroot on Linux.
-quiet('download_from_google_storage',
-     '--no_resume --no_auth --bucket chromium-gn',
-     '-s ', gn_path() + '.sha1')
-quiet('python tools/clang/scripts/update.py --if-needed')
-if 'linux' in sys.platform:
-  quiet('python build/linux/sysroot_scripts/install-sysroot.py --arch=amd64')
-
-# Pass all our arguments over to the real GN binary.
-loud(gn_path(), *sys.argv[1:])