Add comments setting emacs and vim tab width and expansion variables....

o3d/installer/mac/installer.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'nppversion': '<!(python ../../plugin/version_info.py --commaversion)',
     'dotnppversion': '<!(python ../../plugin/version_info.py --version)',
 
@@ skipping 39 matching lines @@
           'variables': {
             'disk_image_script_path': './make_disk_image.sh',
           },
           'postbuild_name': 'Make Disk Image',
           'action': ['<(disk_image_script_path)', '<(dotnppversion)',],
         },
       ],
     },
   ],
 }
+
+# Local Variables:
+# tab-width:2
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=2 shiftwidth=2: