Add Ash notification UI for OutOfCredits network property

ash/system/chromeos/network/network_state_notifier.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 ASH_SYSTEM_CHROMEOS_NETWORK_NETWORK_STATE_NOTIFIER_H_
 #define ASH_SYSTEM_CHROMEOS_NETWORK_NETWORK_STATE_NOTIFIER_H_
 
 #include <map>
 
 #include "ash/ash_export.h"
+#include "ash/system/chromeos/network/network_tray_delegate.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/time.h"
 #include "chromeos/network/network_state_handler_observer.h"
 
 namespace ash {
 namespace internal {
 
 // This class observes NetworkStateHandler and generates notifications
 // on connection failures.
 class ASH_EXPORT NetworkStateNotifier :
-      public chromeos::NetworkStateHandlerObserver {
+      public chromeos::NetworkStateHandlerObserver,
+      public NetworkTrayDelegate {
  public:
   NetworkStateNotifier();
   virtual ~NetworkStateNotifier();
 
   // NetworkStateHandlerObserver
+  virtual void DefaultNetworkChanged(
+      const chromeos::NetworkState* network) OVERRIDE;
   virtual void NetworkConnectionStateChanged(
       const chromeos::NetworkState* network) OVERRIDE;
+  virtual void NetworkPropertiesUpdated(
+      const chromeos::NetworkState* network) OVERRIDE;
+
+  // NetworkTrayDelegate
+  virtual void NotificationLinkClicked(
+      NetworkObserver::MessageType message_type,
+      size_t link_index) OVERRIDE;
 
  private:
   typedef std::map<std::string, std::string> CachedStateMap;
 
   void InitializeNetworks();
 
   CachedStateMap cached_state_;
+  std::string last_default_network_;
+  std::string cellular_network_;
+  bool cellular_out_of_credits_;
+  base::Time out_of_credits_notify_time_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkStateNotifier);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_NETWORK_NETWORK_STATE_NOTIFIER_H_