Protocol-level changes required to support PIN-less authentication.

remoting/proto/control.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.
 //
 // Protocol for control messages.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
@@ skipping 35 matching lines @@
 
   // Cursor pixmap data in 32-bit BGRA format.
   optional bytes data = 5;
 }
 
 message Capabilities {
   // List of capabilities supported by the sender (case sensitive, capabilities
   // are separated by spaces).
   optional string capabilities = 1;
 }
+
+message PairingRequest {
+  // Human-readable name of the client.
+  optional string client_name = 1;
+}
+
+message PairingResponse {
+  // Unique identifier for this client.
+  optional string client_id = 1;
+
+  // Shared secret for this client.
+  optional string shared_secret = 2;
+}