Add a timezone utility file to base/.

base/base.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 329 matching lines @@
         'i18n/number_formatting.cc',
         'i18n/number_formatting.h',
         'i18n/rtl.cc',
         'i18n/rtl.h',
         'i18n/string_compare.cc',
         'i18n/string_compare.h',
         'i18n/string_search.cc',
         'i18n/string_search.h',
         'i18n/time_formatting.cc',
         'i18n/time_formatting.h',
+        'i18n/timezone.cc',
+        'i18n/timezone.h',
       ],
     },
     {
       'target_name': 'base_message_loop_tests',
       'type': 'static_library',
       'dependencies': [
         'base',
         '../testing/gtest.gyp:gtest',
       ],
       'sources': [
@@ skipping 162 matching lines @@
         'id_map_unittest.cc',
         'i18n/break_iterator_unittest.cc',
         'i18n/char_iterator_unittest.cc',
         'i18n/case_conversion_unittest.cc',
         'i18n/file_util_icu_unittest.cc',
         'i18n/icu_string_conversions_unittest.cc',
         'i18n/number_formatting_unittest.cc',
         'i18n/rtl_unittest.cc',
         'i18n/string_search_unittest.cc',
         'i18n/time_formatting_unittest.cc',
+        'i18n/timezone_unittest.cc',
         'ini_parser_unittest.cc',
         'ios/device_util_unittest.mm',
         'json/json_parser_unittest.cc',
         'json/json_reader_unittest.cc',
         'json/json_value_converter_unittest.cc',
         'json/json_value_serializer_unittest.cc',
         'json/json_writer_unittest.cc',
         'json/string_escape_unittest.cc',
         'lazy_instance_unittest.cc',
         'logging_unittest.cc',
@@ skipping 820 matching lines @@
             'base_unittests.isolate',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }