tray: Show warning in network tray when VPN or proxy used.

chrome/browser/ui/webui/chromeos/login/network_state_informer.h

 // Copyright (c) 2012 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 CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_NETWORK_STATE_INFORMER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_NETWORK_STATE_INFORMER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 33 matching lines @@
 
   class NetworkStateInformerObserver {
    public:
     NetworkStateInformerObserver() {}
     virtual ~NetworkStateInformerObserver() {}
 
     virtual void UpdateState(NetworkError::ErrorReason reason) = 0;
     virtual void OnNetworkReady() {}
   };
 
+  static bool HasDefaultNetworkProxyConfigured();
+
   NetworkStateInformer();
 
   void Init();
 
   // Adds observer to be notified when network state has been changed.
   void AddObserver(NetworkStateInformerObserver* observer);
 
   // Removes observer.
   void RemoveObserver(NetworkStateInformerObserver* observer);
 
@@ skipping 36 matching lines @@
 
   base::ObserverList<NetworkStateInformerObserver> observers_;
   content::NotificationRegistrar registrar_;
 
   base::WeakPtrFactory<NetworkStateInformer> weak_ptr_factory_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_NETWORK_STATE_INFORMER_H_