Protocol / client plugin changes to support interactively asking for a PIN

remoting/client/client_config.h

Index: remoting/client/client_config.h
diff --git a/remoting/client/client_config.h b/remoting/client/client_config.h
index bf8474bd87e87058582cefe7da28b3791b9851ac..be28f349eb7dd6a661010b90705018a1488477f8 100644
--- a/remoting/client/client_config.h
+++ b/remoting/client/client_config.h
@@ -10,6 +10,7 @@
 
 #include "base/basictypes.h"
 #include "remoting/protocol/authentication_method.h"
+#include "remoting/protocol/negotiating_authenticator.h"
 
 namespace remoting {
 
@@ -22,7 +23,7 @@ struct ClientConfig {
   std::string host_jid;
   std::string host_public_key;
 
-  std::string shared_secret;
+  protocol::FetchPinCallback fetch_pin_callback;
   std::vector<protocol::AuthenticationMethod> authentication_methods;
   std::string authentication_tag;
 };