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

remoting/protocol/client_control_dispatcher.h

Index: remoting/protocol/client_control_dispatcher.h
diff --git a/remoting/protocol/client_control_dispatcher.h b/remoting/protocol/client_control_dispatcher.h
index dce4d9b39d794446483ed6adb6b0e309fb4260df..c2f83a3359af88125b7aa027f1c9917ceef13f0b 100644
--- a/remoting/protocol/client_control_dispatcher.h
+++ b/remoting/protocol/client_control_dispatcher.h
@@ -39,6 +39,9 @@ class ClientControlDispatcher : public ChannelDispatcherBase,
   virtual void ControlVideo(const VideoControl& video_control) OVERRIDE;
   virtual void ControlAudio(const AudioControl& audio_control) OVERRIDE;
   virtual void SetCapabilities(const Capabilities& capabilities) OVERRIDE;
+  virtual void RequestPairing(
+      const PairingRequest& pairing_request,
+      const base::Callback<void(const PairingReply&)>&) OVERRIDE;
 
   // Sets the ClientStub that will be called for each incoming control
   // message. |client_stub| must outlive this object.
@@ -64,6 +67,8 @@ class ClientControlDispatcher : public ChannelDispatcherBase,
   ProtobufMessageReader<ControlMessage> reader_;
   BufferedSocketWriter writer_;
 
+  base::Callback<void(const PairingReply&)> latest_pairing_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(ClientControlDispatcher);
 };