Add Ash notification UI for OutOfCredits network property

ash/system/chromeos/network/network_state_notifier.h

Index: ash/system/chromeos/network/network_state_notifier.h
diff --git a/ash/system/chromeos/network/network_state_notifier.h b/ash/system/chromeos/network/network_state_notifier.h
index 129e50782420ec41850d878be73a883b3dde177f..0832184dc741b244509ce6c2ef74e26a13479382 100644
--- a/ash/system/chromeos/network/network_state_notifier.h
+++ b/ash/system/chromeos/network/network_state_notifier.h
@@ -8,8 +8,10 @@
 #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 {
@@ -18,14 +20,24 @@ 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;
@@ -33,6 +45,10 @@ class ASH_EXPORT NetworkStateNotifier :
   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);
 };