Added definition of the policy DeviceLoginScreenDomainAutoComplete.

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 447 matching lines @@
   // will be enabled when the login screen is shown. If this policy is set to
   // false, the on-screen keyboard will be disabled when the login screen is
   // shown. Users can temporarily override this setting by enabling or disabling
   // the on-screen keyboard. However, the user's choice is not persistent and
   // the default is restored whenever the login screen is shown anew or the user
   // remains idle on the login screen for a minute. If this policy is left
   // unset, the on-screen keyboard is disabled when the login screen is first
   // shown. Users can enable or disable the on-screen keyboard anytime and its
   // status on the login screen is persisted between users.
   optional bool login_screen_default_virtual_keyboard_enabled = 5;
+
+  // If this policy is not configured or set to a blank string,
+  // no autocomplete option during user sign-in flow will be shown.
+  // If this policy is set to a string representing a domain name, an
+  // autocomplete option during user sign-in will be shown allowing the user
+  // to type in only his user name without the domain name extension. The user
+  // will be able to overwrite this domain name extension.
+  optional string login_screen_domain_auto_complete = 6;
 }
 
 message SupervisedUsersSettingsProto {
   // Defines whether supervised users can be created on the device.
   optional bool supervised_users_enabled = 1;
 }
 
 message LoginScreenPowerManagementProto {
   // Configures power management on the login screen. The policy should be
   // specified as a string that expresses the individual settings in JSON
@@ skipping 169 matching lines @@
   optional SupervisedUsersSettingsProto supervised_users_settings = 28;
   optional LoginScreenPowerManagementProto login_screen_power_management = 29;
   optional SystemUse24HourClockProto use_24hour_clock = 30;
   optional AutoCleanupSettigsProto auto_clean_up_settings = 31;
   optional SystemSettingsProto system_settings = 32;
   optional SAMLSettingsProto saml_settings = 33;
   optional RebootOnShutdownProto reboot_on_shutdown = 34;
   optional DeviceHeartbeatSettingsProto device_heartbeat_settings = 35;
   optional ExtensionCacheSizeProto extension_cache_size = 36;
 }