ChromeOS: Add SystemTimezoneAutomaticDetection policy.

chrome/browser/chromeos/policy/proto/chrome_device_policy.proto

 // 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.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package enterprise_management;
 
@@ skipping 231 matching lines @@
   // all users. Valid values are listed in "timezone_settings.cc". Additionally,
   // timezones from the "IANA Time Zone Database" (e.g. listed on wikipedia)
   // that are equivalent to one of the timezones in "timezone_settings.cc" are
   // valid. In case of an invalid value, the setting is still activated with a
   // fallback timezone (currently "GMT"). In case of an empty string or if no
   // value is provided, the timezone device setting is inactive. In that case,
   // the currently active timezone will remain in use however users can change
   // the timezone and the change is persistent. Thus a change by one user
   // affects the login-screen and all other users.
   optional string timezone = 1;
+
+  // This allows domain administrators to control the timezone settings for
+  // their devices.
+  enum AutomaticTimezoneDetectionType {
+    USERS_DECIDE = 0;
+    DISABLED = 1;
+    IP_ONLY = 2;
+    SEND_WIFI_ACCESS_POINTS = 3;
+  };
+
+  optional AutomaticTimezoneDetectionType timezone_detection_type = 2;
 }
 
 message SystemUse24HourClockProto {
   // Specifies an owner-determined clock format that applies to the login
   // screen and is used as a default for all user sessions. Users can still
   // override the format to use for their account.
   //
   // True and false select a 24 and 12 hour clock format, respectively. The
   // default format for the case the setting is not present is 24 hour clock.
   optional bool use_24hour_clock = 1;
@@ skipping 475 matching lines @@
       login_screen_domain_auto_complete = 37;
   optional DeviceLogUploadSettingsProto device_log_upload_settings = 38;
   optional DisplayRotationDefaultProto display_rotation_default = 39;
   optional AllowKioskAppControlChromeVersionProto
       allow_kiosk_app_control_chrome_version = 40;
   optional LoginAuthenticationBehaviorProto login_authentication_behavior = 41;
   optional UsbDetachableWhitelistProto usb_detachable_whitelist = 42;
   optional AllowBluetoothProto allow_bluetooth = 43;
   optional DeviceQuirksDownloadEnabledProto quirks_download_enabled = 44;
 }