Notify calling web-app when Host plugin becomes connected to a client.

remoting/host/chromoting_host.h

 // Copyright (c) 2011 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.
 
 #ifndef REMOTING_CHROMOTING_HOST_H_
 #define REMOTING_CHROMOTING_HOST_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 151 matching lines @@
   };
 
   // This method is called if a client is disconnected from the host.
   void OnClientDisconnected(protocol::ConnectionToClient* client);
 
   // Creates encoder for the specified configuration.
   Encoder* CreateEncoder(const protocol::SessionConfig* config);
 
   std::string GenerateHostAuthToken(const std::string& encoded_client_token);
 
-  bool HasAuthenticatedClients() const;
+  int AuthenticatedClientsCount() const;
 
   void EnableCurtainMode(bool enable);
 
   void MonitorLocalInputs(bool enable);
 
   void ProcessPreAuthentication(
       const scoped_refptr<protocol::ConnectionToClient>& connection);
 
   // Show or hide the Disconnect window on the UI thread.  If |show| is false,
   // hide the window, ignoring the |username| parameter.
@@ skipping 63 matching lines @@
   // Stores list of tasks that should be executed when we finish
   // shutdown. Used only while |state_| is set to kStopping.
   std::vector<Task*> shutdown_tasks_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromotingHost);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_CHROMOTING_HOST_H_