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

ash/system/chromeos/network/tray_network.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_TRAY_NETWORK_H
 #define ASH_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_H
 
 #include <set>
 
 #include "ash/system/chromeos/network/network_observer.h"
@@ skipping 13 matching lines @@
 class NetworkDetailedView;
 class NetworkTrayView;
 }
 
 class TrayNetwork : public SystemTrayItem,
                     public NetworkObserver,
                     public NetworkPortalDetectorObserver,
                     public TrayNetworkStateObserver::Delegate {
  public:
   explicit TrayNetwork(SystemTray* system_tray);
-  virtual ~TrayNetwork();
+  ~TrayNetwork() override;
 
   tray::NetworkDetailedView* detailed() { return detailed_; }
 
   // SystemTrayItem
-  virtual views::View* CreateTrayView(user::LoginStatus status) override;
-  virtual views::View* CreateDefaultView(user::LoginStatus status) override;
-  virtual views::View* CreateDetailedView(user::LoginStatus status) override;
-  virtual void DestroyTrayView() override;
-  virtual void DestroyDefaultView() override;
-  virtual void DestroyDetailedView() override;
-  virtual void UpdateAfterLoginStatusChange(user::LoginStatus status) override;
-  virtual void UpdateAfterShelfAlignmentChange(
-      ShelfAlignment alignment) override;
+  views::View* CreateTrayView(user::LoginStatus status) override;
+  views::View* CreateDefaultView(user::LoginStatus status) override;
+  views::View* CreateDetailedView(user::LoginStatus status) override;
+  void DestroyTrayView() override;
+  void DestroyDefaultView() override;
+  void DestroyDetailedView() override;
+  void UpdateAfterLoginStatusChange(user::LoginStatus status) override;
+  void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) override;
 
   // NetworkObserver
-  virtual void RequestToggleWifi() override;
+  void RequestToggleWifi() override;
 
   // NetworkPortalDetectorObserver
-  virtual void OnCaptivePortalDetected(
-      const std::string& service_path) override;
+  void OnCaptivePortalDetected(const std::string& service_path) override;
 
   // TrayNetworkStateObserver::Delegate
-  virtual void NetworkStateChanged(bool list_changed) override;
-  virtual void NetworkServiceChanged(
-      const chromeos::NetworkState* network) override;
+  void NetworkStateChanged() override;
 
  private:
   tray::NetworkTrayView* tray_;
   tray::NetworkDefaultView* default_;
   tray::NetworkDetailedView* detailed_;
   bool request_wifi_view_;
   scoped_ptr<TrayNetworkStateObserver> network_state_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayNetwork);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_H