Add a timezone utility file to base/.

base/i18n/timezone.h

Index: base/i18n/timezone.h
diff --git a/base/i18n/timezone.h b/base/i18n/timezone.h
new file mode 100644
index 0000000000000000000000000000000000000000..d57a6fbb7a5a71faaddb2c327367e5d0b57136a8
--- /dev/null
+++ b/base/i18n/timezone.h
@@ -0,0 +1,20 @@
+// 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.
+BASE_I18N_EXPORT std::string CountryForCurrentTimezone();
+
+}  // namespace base
+
+#endif  // BASE_TIME_TIMEZONE_H_