Add a timezone utility file to base/.

base/i18n/timezone_unittest.cc

+// Copyright (c) 2011 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 {
+
+TEST(TimezoneTest, CountryCodeForCurrentTimezone) {
+  std::string country_code = CountryForCurrentTimezone();
+  EXPECT_EQ(2U, country_code.size());
+}
+
+}  // namespace
+}  // namespace base