Policy definition for encryptfs to ext4 migration strategy

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 761 matching lines @@
 message LoginScreenInputMethodsProto {
   repeated string login_screen_input_methods = 1;
 }
 
 // The url and hash that specified in JSON format that can be used to set the
 // device-level wallpaper on the login screen before any user logs in.
 message DeviceWallpaperImageProto {
   optional string device_wallpaper_image = 1;
 }
 
+// Migration strategy for the case when ARC(N) needs the ext4 encryption while

[use bartfab instead, 2017/05/17 14:28:10]

Nit: s/N/N+/

+// the device used ecryptfs in the past.
+message DeviceEcryptfsMigrationStrategyProto {
+  enum MigrationStrategy {
+    // ARC is not allowed, no data migration needed.
+    DISALLOW_ARC = 0;
+    // The data migration is allowed, opening the possibility to use ARC.
+    ALLOW_MIGRATION = 1;
+  };
+
+  optional MigrationStrategy migration_strategy = 1 [default = DISALLOW_ARC];
+}
+
 message ChromeDeviceSettingsProto {
   optional DevicePolicyRefreshRateProto device_policy_refresh_rate = 1;
   optional UserWhitelistProto user_whitelist = 2;
   optional GuestModeEnabledProto guest_mode_enabled = 3;
   optional OBSOLETE_DeviceProxySettingsProto device_proxy_settings = 4
       [deprecated = true];
   optional CameraEnabledProto camera_enabled = 5;
   optional ShowUserNamesOnSigninProto show_user_names = 6;
   optional DataRoamingEnabledProto data_roaming_enabled = 7;
   optional AllowNewUsersProto allow_new_users = 8;
@@ skipping 38 matching lines @@
   optional AllowBluetoothProto allow_bluetooth = 43;
   optional DeviceQuirksDownloadEnabledProto quirks_download_enabled = 44;
   optional LoginVideoCaptureAllowedUrlsProto login_video_capture_allowed_urls =
       45;
   optional DeviceLoginScreenAppInstallListProto
       device_login_screen_app_install_list = 46;
   optional NetworkThrottlingEnabledProto network_throttling = 47;
   optional DeviceWallpaperImageProto device_wallpaper_image = 48;
   optional LoginScreenLocalesProto login_screen_locales = 49;
   optional LoginScreenInputMethodsProto login_screen_input_methods = 50;
+  optional DeviceEcryptfsMigrationStrategyProto
+      device_ecryptfs_migration_strategy = 51;
 }