This adds the onNetworkChanged event to networkingPrivate

chrome/browser/chromeos/extensions/networking_private_event_router.h

+// Copyright (c) 2013 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 CHROME_BROWSER_CHROMEOS_EXTENSIONS_NETWORKING_PRIVATE_EVENT_ROUTER_H_
+#define CHROME_BROWSER_CHROMEOS_EXTENSIONS_NETWORKING_PRIVATE_EVENT_ROUTER_H_
+
+#include "chrome/browser/extensions/event_router.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
+#include "chromeos/network/network_state_handler_observer.h"
+
+class Profile;
+
+namespace chromeos {
+
+// This is a factory class used by the ProfileDependencyManager to instantiate
+// the event router that will forward events from the NetworkStateHandler to the
+// JavaScript Networking API.
+class NetworkingPrivateEventRouter : public ProfileKeyedService,
+                                     public extensions::EventRouter::Observer,
+                                     public NetworkStateHandlerObserver {
+ public:
+  explicit NetworkingPrivateEventRouter(Profile* profile);
+  virtual ~NetworkingPrivateEventRouter();
+
+ protected:
+  // ProfileKeyedService overrides:
+  virtual void Shutdown() OVERRIDE;
+
+  // EventRouter::Observer overrides:
+  virtual void OnListenerAdded(
+      const extensions::EventListenerInfo& details) OVERRIDE;
+  virtual void OnListenerRemoved(
+      const extensions::EventListenerInfo& details) OVERRIDE;
+
+  // NetworkStateHandlerObserver overrides:
+  virtual void NetworkListChanged(const NetworkStateList& networks) OVERRIDE;
+
+ private:
+  // Decide if we should listen for network changes or not. If there are any
+  // JavaScript listeners registered for the onNetworkChanged event, then we
+  // want to register for change notification from the network state handler.
+  // Otherwise, we want to unregister and not be listening to network changes.
+  void StartOrStopListeningForNetworkChanges();
+
+  Profile* profile_;
+  bool listening_;
+
+  DISALLOW_COPY_AND_ASSIGN(NetworkingPrivateEventRouter);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_NETWORKING_PRIVATE_EVENT_ROUTER_H_