Introduce a state flag within the signed policy response.

chrome/browser/policy/proto/device_management_backend.proto

 // Copyright (c) 2011 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 @@
   // increased by 1 at each key rotation.)
   optional int32 public_key_version = 6;
 
   // The user this policy is intended for. In case of device policy, the name
   // of the owner (who registered the device).
   optional string username = 7;
 
   // In this field the DMServer should echo back the "deviceid" HTTP parameter
   // from the request.
   optional string device_id = 8;
+
+  // Indicates which state this association with DMServer is in. This can be
+  // used to tell the client that it is not receiving policy even though the
+  // registration with the server is kept active.
+  enum AssociationState {
+    // Association is active and policy is pushed.
+    ACTIVE = 0;
+    // Association is alive, but the corresponding domain is not managed.
+    UNMANAGED = 1;
+  }
+  optional AssociationState state = 9 [default = ACTIVE];
 }
 
 message PolicyFetchResponse {
   // Since a single policy request may ask for multiple policies, we
   // provide separate error code for each individual policy fetch.
 
   // We will use standard HTTP Status Code as error code.
   optional int32  error_code = 1;
 
   // Human readable error message for customer support purpose.
@@ skipping 88 matching lines @@
 
   // Register response
   optional DeviceRegisterResponse register_response = 3;
 
   // Unregister response
   optional DeviceUnregisterResponse unregister_response = 4;
 
   // Policy response.
   optional DevicePolicyResponse policy_response = 5;
 }