Add enterprise policy support to scatter downloading of ChromeOS updates

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 143 matching lines @@
   // 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;
+
+  // The Chrome browser version (e.g. "17.*") corresponding to the
+  // target_version_prefix above. The target_version_prefix is the internal OS
+  // version that external users normally are not aware of. This display_name
+  // can be used by the devices to display a message to end-users about the auto
+  // update setting.
+  optional string target_version_display_name = 3;
+
+  // Specifies the number of seconds up to which a device may randomly
+  // delay its download of an update from the time the update was first pushed
+  // out to the server. The device may wait a portion of this time in terms
+  // of wall-clock-time and the remaining portion in terms of the number of
+  // update checks. In any case, the scatter is upper bounded to a constant
+  // amount of time so that a device does not ever get stuck waiting to download
+  // an update forever.
+  optional int64 scatter_factor_in_seconds = 4;
 }
 
 message StartUpUrlsProto {
   // Specifies the URLs to be loaded on login to the anonymous account used if
   // the device is in RETAIL mode.
   repeated string start_up_urls = 1;
 }
 
 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;
   optional StartUpUrlsProto start_up_urls = 18;
 }