Turn on hermetic toolchain for all corp machines.

build/mac/should_use_hermetic_xcode.py

Index: build/mac/should_use_hermetic_xcode.py
diff --git a/build/mac/should_use_hermetic_xcode.py b/build/mac/should_use_hermetic_xcode.py
new file mode 100755
index 0000000000000000000000000000000000000000..14ddfacdc5020b780334eb838ebe9bfddbd06314
--- /dev/null
+++ b/build/mac/should_use_hermetic_xcode.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+# Copyright 2016 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.
+
+"""Prints "1" if Chrome targets should be built with hermetic xcode. Otherwise
+prints "0"."""
+
+import os
+import sys
+
+
+def _IsCorpMachine():
+  return os.path.isdir('/Library/GoogleCorpSupport/')
+
+
+def main():
+  if os.environ.get('FORCE_MAC_TOOLCHAIN') or _IsCorpMachine():
+    return "1"
+  else:
+    return "0"
+
+
+if __name__ == '__main__':
+  print main()
+  sys.exit(0)