Add logging for slow device events, limit network UI update rate

ash/system/chromeos/network/network_detailed_view.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_DETAILED_VIEW_H
 #define ASH_SYSTEM_CHROMEOS_NETWORK_NETWORK_DETAILED_VIEW_H
 
 #include "ash/system/tray/tray_details_view.h"
 #include "chromeos/network/network_state_handler.h"
 
@@ skipping 11 matching lines @@
   };
 
   explicit NetworkDetailedView(SystemTrayItem* owner)
       : TrayDetailsView(owner) {
   }
 
   virtual void Init() = 0;
 
   virtual DetailedViewType GetViewType() const = 0;
 
-  // Called when network manager state has changed.
-  // (Generic update for NetworkTray <> AshSystemTrayDelegate interface).
-  virtual void ManagerChanged() = 0;
-
-  // Called when the contents of the network list have changed.
+  // Called when the contents of the network list have changed or when any
+  // Manager properties (e.g. technology state) have changed.
   // (Called only from TrayNetworkStateObserver).
-  virtual void NetworkListChanged() = 0;
-
-  // Called when a network service property has changed.
-  // (Called only from TrayNetworkStateObserver).
-  virtual void NetworkServiceChanged(const chromeos::NetworkState* network) = 0;
+  virtual void Update() = 0;
 
  protected:
   virtual ~NetworkDetailedView() {}
 };
 
 }  // namespace tray
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_NETWORK_NETWORK_DETAILED_VIEW_H