ChromeOS should have UTC timezone option.

chrome/browser/chromeos/system/timezone_util.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 "chrome/browser/chromeos/system/timezone_util.h"
 
 #include <string>
 
 #include "base/i18n/rtl.h"
 #include "base/lazy_instance.h"
@@ skipping 100 matching lines @@
 
   // TODO(jungshik): When coming up with a better list of timezones, we also
   // have to come up with better 'display' names. One possibility is to list
   // multiple cities (e.g. "Los Angeles, Vancouver .." in the order of
   // the population of a country the city belongs to.).
   // We can also think of using LONG_GENERIC or LOCATION once we upgrade
   // to ICU 4.6.
   // In the meantime, we use "LONG" name with "Exemplar City" to distinguish
   // multiple timezones with the same "LONG" name but with different
   // rules (e.g. US Mountain Time in Denver vs Phoenix).
+  icu::UnicodeString id;
   icu::UnicodeString name;
-  timezone.getDisplayName(dst_offset != 0, icu::TimeZone::LONG, name);
+  timezone.getID(id);
+  if (id == icu::UnicodeString(chromeos::system::kUTCTimezoneName)) {
+    name = icu::UnicodeString(
+        l10n_util::GetStringUTF8(IDS_OPTIONS_SETTINGS_TIMEZONE_DISPLAY_NAME_UTC)
+            .c_str());
+  } else {
+    timezone.getDisplayName(dst_offset != 0, icu::TimeZone::LONG, name);
+  }
   base::string16 result(l10n_util::GetStringFUTF16(
       IDS_OPTIONS_SETTINGS_TIMEZONE_DISPLAY_TEMPLATE,
       base::ASCIIToUTF16(offset_str),
       base::string16(name.getBuffer(), name.length()),
       GetExemplarCity(timezone)));

[jungshik at Google, 2015/10/16 22:47:15]

The end result in en-US would be 

UTC+00:00 Coordinated Universal Time (GMT) 

Well, that's not that bad. 

   base::i18n::AdjustStringForLocaleDirection(&result);
   return result;
 }
 
 }  // namespace
 
 namespace chromeos {
 namespace system {
 
 // Creates a list of pairs of each timezone's ID and name.
@@ skipping 52 matching lines @@
     VLOG(1) << "Refresh TimeZone: setting timezone to '" << timezone->timeZoneId
             << "'";
 
     chromeos::system::TimezoneSettings::GetInstance()->SetTimezoneFromID(
         base::UTF8ToUTF16(timezone->timeZoneId));
   }
 }
 
 }  // namespace system
 }  // namespace chromeos