New device policies for enterprise auto-update controls.

chrome/browser/policy/proto/chrome_device_policy.proto

 // Copyright (c) 2012 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 121 matching lines @@
   // login screen if no user activity is present. Only respected if the device
   // is in KIOSK mode.
   optional string screen_saver_extension_id = 1;
 
   // Specifies the timeout before the screen saver is activated. If this field
   // is omitted or set to 0, no screen-saver will be started.
   // Measured in milliseconds.
   optional int64 screen_saver_timeout = 2;
 }
 
+// Enterprise controls for auto-update behavior of Chrome OS.
+message AutoUpdateSettingsProto {
+  // True if we don't want the device to auto-update (target_version_prefix is
+  // ignored in this case).
+  optional bool update_disabled = 1;
+
+  // Specifies the prefix of the target version we want the device to
+  // update to, if it's on a older version. If the device is already on
+  // a version with the given prefix, then there's no effect. If the device is
+  // on a higher version, it will remain on the higher version as we
+  // don't support rollback yet. The format of this version can be one
+  // of the following:
+  // ---------------------------------------------------------------------
+  // "" (or not set at all): update to latest version available.
+  // 1412.: update to any minor version of 1412 (e.g. 1412.24.34 or 1412.60.2)
+  // 1412.2.: update to any minor version of 1412.2 (e.g. 1412.2.34 or 1412.2.2)
+  // 1412.24.34: update to this specific version only
+  // ---------------------------------------------------------------------
+  optional string target_version_prefix = 2;
+}
+
 message ChromeDeviceSettingsProto {
   optional DevicePolicyRefreshRateProto device_policy_refresh_rate = 1;
   optional UserWhitelistProto user_whitelist = 2;
   optional GuestModeEnabledProto guest_mode_enabled = 3;
   optional DeviceProxySettingsProto device_proxy_settings = 4;
   optional CameraEnabledProto camera_enabled = 5;
   optional ShowUserNamesOnSigninProto show_user_names = 6;
   optional DataRoamingEnabledProto data_roaming_enabled = 7;
   optional AllowNewUsersProto allow_new_users = 8;
   optional MetricsEnabledProto metrics_enabled = 9;
   optional ReleaseChannelProto release_channel = 10;
   optional DeviceOpenNetworkConfigurationProto open_network_configuration = 11;
   optional DeviceReportingProto device_reporting = 12;
   optional EphemeralUsersEnabledProto ephemeral_users_enabled = 13;
   optional AppPackProto app_pack = 14;
   optional ForcedLogoutTimeoutsProto forced_logout_timeouts = 15;
   optional ScreenSaverProto login_screen_saver = 16;
+  optional AutoUpdateSettingsProto auto_update_settings = 17;
 }