Add Sync data type for managed users.

sync/protocol/managed_user_specifics.proto

Index: sync/protocol/managed_user_specifics.proto
diff --git a/sync/protocol/managed_user_setting_specifics.proto b/sync/protocol/managed_user_specifics.proto
similarity index 68%
copy from sync/protocol/managed_user_setting_specifics.proto
copy to sync/protocol/managed_user_specifics.proto
index fcd1d964267beb42d04cd2cc67d7d9dc70191b41..2cdffd3e77f71deae35f25aebf1e37bda58f8738 100644
--- a/sync/protocol/managed_user_setting_specifics.proto
+++ b/sync/protocol/managed_user_specifics.proto
@@ -1,4 +1,4 @@
-// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// 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.
 //
@@ -15,7 +15,8 @@ option retain_unknown_fields = true;
 package sync_pb;
 
 // Properties of managed user setting sync objects.
-message ManagedUserSettingSpecifics {
-  optional string name = 1;
-  optional string value = 2;
+message ManagedUserSpecifics {
+  optional string id = 1;
+  optional string name = 2;
+  optional bool acknowledged = 3 [default = false];

[tim (not reviewing), 2013/05/23 18:23:27]

Describe what 'acknowledged' means in this context.  It would also be useful to
explain the different semantics of |id| and |name|.

[Bernhard Bauer, 2013/05/23 20:08:17]

Done.

 }