Add a timezone utility file to base/.

Currently there's just one function exported, which checks the system timezone and returns a 2-character ASCII country code for it.

BUG=303368

Review URL: https://codereview.chromium.org/26315008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235823 0039d316-1c4b-4281-b951-d872f2087c98

base/base.gyp

@@ -347,6 +347,8 @@
         'i18n/string_search.h',
         'i18n/time_formatting.cc',
         'i18n/time_formatting.h',
+        'i18n/timezone.cc',
+        'i18n/timezone.h',
       ],
     },
     {
@@ -529,6 +531,7 @@
         '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',

base/i18n/timezone.h

+// Copyright 2013 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.
+
+#ifndef BASE_I18N_TIMEZONE_H_
+#define BASE_I18N_TIMEZONE_H_
+
+#include <string>
+
+#include "base/i18n/base_i18n_export.h"
+
+namespace base {
+
+// Checks the system timezone and turns it into a two-character ASCII country
+// code. If this fails for some reason (for example, it will always fail on
+// Android), it will return an empty string.
+BASE_I18N_EXPORT std::string CountryCodeForCurrentTimezone();
+
+}  // namespace base
+
+#endif  // BASE_TIME_TIMEZONE_H_

base/i18n/timezone_unittest.cc

+// Copyright 2013 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.
+
+#include "base/i18n/timezone.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+namespace {
+
+#if defined(OS_ANDROID)
+// icu's timezone utility doesn't work on Android.
+#define MAYBE_CountryCodeForCurrentTimezone DISABLED_CountryCodeForCurrentTimezone
+#else
+#define MAYBE_CountryCodeForCurrentTimezone CountryCodeForCurrentTimezone
+#endif
+
+TEST(TimezoneTest, MAYBE_CountryCodeForCurrentTimezone) {
+  std::string country_code = CountryCodeForCurrentTimezone();
+  EXPECT_EQ(2U, country_code.size());
+}
+
+}  // namespace
+}  // namespace base