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

chromeos/network/proxy/ui_proxy_config_service.h

 // Copyright 2013 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 CHROMEOS_NETWORK_PROXY_UI_PROXY_CONFIG_SERVICE_H_
 #define CHROMEOS_NETWORK_PROXY_UI_PROXY_CONFIG_SERVICE_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 32 matching lines @@
   // * A policy enforced proxy associated with |network_guid|.
   // * A proxy set by an extension in the active PrefService.
   // * A user specified proxy associated with |network_guid|.
   void GetProxyConfig(const std::string& network_guid, UIProxyConfig* config);
 
   // Called from the UI to update the user proxy configuration for
   // |network_guid|. The proxy specified by |config| is stored by Shill.
   void SetProxyConfig(const std::string& network_guid,
                       const UIProxyConfig& config);
 
+  // Returns true if there is a default network and it has a proxy configuration
+  // with mode == MODE_FIXED_SERVERS.
+  bool HasDefaultNetworkProxyConfigured();
+
  private:
   // Determines effective proxy config based on prefs from config tracker,
   // |network| and if user is using shared proxies.  The effective config is
   // stored in |current_ui_config_| but not activated on network stack, and
   // hence, not picked up by observers.
   void DetermineEffectiveConfig(const NetworkState& network);
 
   void OnPreferenceChanged(const std::string& pref_name);
 
   // GUID of network used for current_ui_config_.
   std::string current_ui_network_guid_;
 
   // Proxy configuration for |current_ui_network_guid_|.
   UIProxyConfig current_ui_config_;
 
   PrefService* profile_prefs_;  // unowned
   PrefChangeRegistrar profile_registrar_;
 
   PrefService* local_state_prefs_;  // unowned
   PrefChangeRegistrar local_state_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(UIProxyConfigService);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_NETWORK_PROXY_UI_PROXY_CONFIG_SERVICE_H_