ChromeOS should have UTC timezone option.

chromeos/settings/timezone_settings.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 CHROMEOS_SETTINGS_TIMEZONE_SETTINGS_H_
 #define CHROMEOS_SETTINGS_TIMEZONE_SETTINGS_H_
 
 #include <vector>
 
 #include "base/strings/string16.h"
+#include "chromeos/chromeos_export.h"
 #include "chromeos/settings/cros_settings_provider.h"
 #include "third_party/icu/source/i18n/unicode/timezone.h"
 
 namespace chromeos {
 namespace system {
 
+// Canonical name of UTC timezone.
+CHROMEOS_EXPORT extern const char kUTCTimezoneName[];
+
 // This interface provides access to Chrome OS timezone settings.
 class CHROMEOS_EXPORT TimezoneSettings {
  public:
   class Observer {
    public:
     // Called when the timezone has changed. |timezone| is non-null.
     virtual void TimezoneChanged(const icu::TimeZone& timezone) = 0;
    protected:
     virtual ~Observer();
   };
@@ skipping 17 matching lines @@
   static base::string16 GetTimezoneID(const icu::TimeZone& timezone);
 
  protected:
   virtual ~TimezoneSettings() {}
 };
 
 }  // namespace system
 }  // namespace chromeos
 
 #endif  // CHROMEOS_SETTINGS_TIMEZONE_SETTINGS_H_