Flag auto-enrollment register requests.

chrome/browser/policy/proto/device_management_backend.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 19 matching lines @@
   optional Type type = 2 [default = TT];
 
   // Machine hardware id, such as serial number.
   // This field is required if register type == DEVICE.
   optional string machine_id = 3;
 
   // Machine model name, such as "ZGA", "Cr-48", "Nexus One".  If the
   // model name is not available, client SHOULD send generic name like
   // "Android", or "Chrome OS".
   optional string machine_model = 4;
+
+  // When true, indicates that the |machine_id| field should be known to the
+  // server. The server can do additional checks based on this information.
+  // This is currently used for requests triggered by auto-enrollment.
+  // Defaults to false when not present.
+  optional bool known_machine_id = 5;
 }
 
 // Response from server to device register request.
 message DeviceRegisterResponse {
   // Device management token for this registration.  This token MUST be
   // part of HTTP Authorization header for all future requests from
   // device to server.
   required string device_management_token = 1;
 
   // Device display name.  By default, server generates the name in
@@ skipping 366 matching lines @@
 
   // Device status report response.
   optional DeviceStatusReportResponse device_status_report_response = 6;
 
   // Session status report response.
   optional SessionStatusReportResponse session_status_report_response = 7;
 
   // Auto-enrollment detection response.
   optional DeviceAutoEnrollmentResponse auto_enrollment_response = 8;
 }