[cros] Add checkbox for toggling data roaming setting.

chrome/browser/chromeos/cros_settings_names.cc

 // Copyright (c) 2010 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/cros_settings_names.h"
 
 namespace chromeos {
 
 const char kCrosSettingsPrefix[] = "cros.";
 
+// All cros.accounts.* settings are stored in SignedSettings.
 const char kAccountsPrefAllowGuest[] = "cros.accounts.allowBWSI";
 const char kAccountsPrefAllowNewUser[] = "cros.accounts.allowGuest";
 const char kAccountsPrefShowUserNamesOnSignIn[]
     = "cros.accounts.showUserNamesOnSignIn";
 const char kAccountsPrefUsers[] = "cros.accounts.users";
 
+// All cros.signed.* settings are stored in SignedSettings.
+const char kSignedDataRoamingEnabled[] = "cros.signed.data_roaming_enabled";
+
 const char kSystemTimezone[] = "cros.system.timezone";
 
 const char kDeviceOwner[] = "cros.device.owner";
 
 const char kStatsReportingPref[] = "cros.metrics.reportingEnabled";
 
 }  // namespace chromeos