Propagate connection state from networking layer to UI.

remoting/protocol/connection_to_host.h

Index: remoting/protocol/connection_to_host.h
diff --git a/remoting/protocol/connection_to_host.h b/remoting/protocol/connection_to_host.h
index 4eb7d15251bd1fb7eec757f06130597658f94cf2..d064b64bf5a47171fc67c6cf7a6ee7e0eadc3b6f 100644
--- a/remoting/protocol/connection_to_host.h
+++ b/remoting/protocol/connection_to_host.h
@@ -64,6 +64,9 @@ class ConnectionToHost : public SignalStrategy::Listener,
 
     // Called when state of the connection changes.
     virtual void OnConnectionState(State state, ErrorCode error) = 0;
+
+    // Called to indicate inactive connection.
+    virtual void OnConnectionInactive(bool inactive) = 0;
   };
 
   ConnectionToHost(bool allow_nat_traversal);
@@ -104,6 +107,8 @@ class ConnectionToHost : public SignalStrategy::Listener,
   virtual void OnSessionStateChange(Session::State state) OVERRIDE;
   virtual void OnSessionRouteChange(const std::string& channel_name,
                                     const TransportRoute& route) OVERRIDE;
+  virtual void OnSessionInactive(const std::string& channel_name,
+                                 bool inactive) OVERRIDE;
 
   // Return the current state of ConnectionToHost.
   State state() const;