Create network change notifier.

webrtc/base/network.h

Index: webrtc/base/network.h
diff --git a/webrtc/base/network.h b/webrtc/base/network.h
index f365a7877262ed30c149daa15bfcf63bf07eac0a..e467979aea9b3c4747f42a21abc70d434ac3b0a0 100644
--- a/webrtc/base/network.h
+++ b/webrtc/base/network.h
@@ -29,6 +29,7 @@ struct ifaddrs;
 namespace rtc {
 
 class Network;
+class NetworkChangeNotifier;
 class Thread;
 
 enum AdapterType {
@@ -147,7 +148,6 @@ class NetworkManagerBase : public NetworkManager {
 
  private:
   friend class NetworkTest;
-  void DoUpdateNetworks();
 
   EnumerationPermission enumeration_permission_;
 
@@ -164,7 +164,8 @@ class NetworkManagerBase : public NetworkManager {
 // Basic implementation of the NetworkManager interface that gets list
 // of networks using OS APIs.
 class BasicNetworkManager : public NetworkManagerBase,
-                            public MessageHandler {
+                            public MessageHandler,
+                            public sigslot::has_slots<> {
  public:
   BasicNetworkManager();
   ~BasicNetworkManager() override;
@@ -222,6 +223,16 @@ class BasicNetworkManager : public NetworkManagerBase,
  private:
   friend class NetworkTest;
 
+  // Creates the network change notifier and starts to listen to the update.
+  void StartNetworkChangeNotifier();
+  // Removes the network change notifier.
+  void StopNetworkChangeNotifier();
+  // Called when it receives the update from the network change notifier.
+  void OnNetworkChangeNotified();
+
+  // Updates the network and reschedule the next update.
+  void UpdateNetworks();
+  // Only updates the network; do not reschedule the next update.

[pthatcher1, 2015/10/09 23:11:29]

do not => does not

[honghaiz3, 2015/10/13 23:19:56]

Done.

   void DoUpdateNetworks();

[pthatcher1, 2015/10/09 23:11:29]

I think a better name pair would be UpdateNetworksContinually/UpdateNetworksOnce
rather than UpdateNetworks/DoUpdateNetworks.

[honghaiz3, 2015/10/13 23:19:56]

Done.

 
   Thread* thread_;
@@ -230,6 +241,7 @@ class BasicNetworkManager : public NetworkManagerBase,
   std::vector<std::string> network_ignore_list_;
   int network_ignore_mask_;
   bool ignore_non_default_routes_;
+  scoped_ptr<NetworkChangeNotifier> network_change_notifier_;
 };
 
 // Represents a Unix-type network interface, with a name and single address.