mash: Convert system tray network item to wm common types

ash/system/chromeos/network/tray_network_state_observer.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_STATE_OBSERVER_H
-#define ASH_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H
-
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/timer/timer.h"
-#include "chromeos/network/network_state_handler_observer.h"
-
-namespace ash {
-
-class TrayNetworkStateObserver : public chromeos::NetworkStateHandlerObserver {
- public:
-  class Delegate {
-   public:
-    // Called when any interesting network changes occur. The frequency of this
-    // event is limited to kUpdateFrequencyMs.
-    virtual void NetworkStateChanged() = 0;
-
-   protected:
-    virtual ~Delegate() {}
-  };
-
-  explicit TrayNetworkStateObserver(Delegate* delegate);
-
-  ~TrayNetworkStateObserver() override;
-
-  // NetworkStateHandlerObserver overrides.
-  void NetworkListChanged() override;
-  void DeviceListChanged() override;
-  void DefaultNetworkChanged(const chromeos::NetworkState* network) override;
-  void NetworkConnectionStateChanged(
-      const chromeos::NetworkState* network) override;
-  void NetworkPropertiesUpdated(const chromeos::NetworkState* network) override;
-
- private:
-  void SignalUpdate();
-  void SendNetworkStateChanged();
-
-  // Unowned Delegate pointer (must outlive this instance).
-  Delegate* delegate_;
-
-  // Set to true when we should purge stale icons in the cache.
-  bool purge_icons_;
-
-  // Frequency at which to push NetworkStateChanged updates. This avoids
-  // unnecessarily frequent UI updates (which can be expensive). We set this
-  // to 0 for tests to eliminate timing variance.
-  int update_frequency_;
-
-  // Timer used to limit the frequency of NetworkStateChanged updates.
-  base::OneShotTimer timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayNetworkStateObserver);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H