Add gnubby authentication to remoting host

remoting/host/chromoting_host.cc

Index: remoting/host/chromoting_host.cc
diff --git a/remoting/host/chromoting_host.cc b/remoting/host/chromoting_host.cc
index e4bdae75990a3a93c2c1ac8229ee2ceb544ee95b..bf47ab6373ef2c437a151b0e5bd04f5c1a6371c9 100644
--- a/remoting/host/chromoting_host.cc
+++ b/remoting/host/chromoting_host.cc
@@ -82,6 +82,7 @@ ChromotingHost::ChromotingHost(
       authenticating_client_(false),
       reject_authenticating_client_(false),
       enable_curtaining_(false),
+      enable_gnubby_auth_(false),
       weak_factory_(this) {
   DCHECK(network_task_runner_->BelongsToCurrentThread());
   DCHECK(signal_strategy);
@@ -169,6 +170,10 @@ void ChromotingHost::SetMaximumSessionDuration(
   max_session_duration_ = max_session_duration;
 }
 
+void ChromotingHost::SetEnableGnubbyAuth(bool enable) {
+  enable_gnubby_auth_ = enable;
+}
+
 ////////////////////////////////////////////////////////////////////////////
 // protocol::ClientSession::EventHandler implementation.
 bool ChromotingHost::OnSessionAuthenticated(ClientSession* client) {
@@ -303,7 +308,8 @@ void ChromotingHost::OnIncomingSession(
       connection.Pass(),
       desktop_environment_factory_,
       max_session_duration_,
-      pairing_registry_);
+      pairing_registry_,
+      enable_gnubby_auth_);
   clients_.push_back(client);
 }