Adding utility method to test the version of the OS.

base/base.gypi

 # Copyright (c) 2012 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 146 matching lines @@
           'guid_win.cc',
           'hash.cc',
           'hash.h',
           'hash_tables.h',
           'hi_res_timer_manager_posix.cc',
           'hi_res_timer_manager_win.cc',
           'hi_res_timer_manager.h',
           'id_map.h',
           'ios/device_util.h',
           'ios/device_util.mm',
+          'ios/ios_util.h',
+          'ios/ios_util.mm',
           'ios/scoped_critical_action.h',
           'ios/scoped_critical_action.mm',
           'json/json_file_value_serializer.cc',
           'json/json_file_value_serializer.h',
           'json/json_parser.cc',
           'json/json_parser.h',
           'json/json_reader.cc',
           'json/json_reader.h',
           'json/json_string_value_serializer.cc',
           'json/json_string_value_serializer.h',
@@ skipping 521 matching lines @@
           # Remove all unnecessary files for build_nexe.py to avoid exceeding
           # command-line-string limitation when building NaCl on Windows.
           ['OS == "win" and >(nacl_untrusted_build)==1', {
               'sources/': [ ['exclude', '\\.h$'] ],
           }],
         ],
       }],
     ],
   },
 }