Fix CreateNetworks to stop it from signaling duplicate networks changed events

webrtc/base/network.h

Index: webrtc/base/network.h
diff --git a/webrtc/base/network.h b/webrtc/base/network.h
index 8980b5d57d8ecb4fda77c064335a7d3ab881383a..f492944f595fd178472d74ba322d67bb1945d14f 100644
--- a/webrtc/base/network.h
+++ b/webrtc/base/network.h
@@ -111,11 +111,10 @@ class NetworkManager : public DefaultLocalAddressProvider {
   // TODO(guoweis): remove this body when chromium implements this.
   virtual void GetAnyAddressNetworks(NetworkList* networks) {}
 
+  // Dumps the current list of networks in the network manager.
+  virtual void DumpNetworks() {}
   bool GetDefaultLocalAddress(int family, IPAddress* ipaddr) const override;
 
-  // Dumps a list of networks available to LS_INFO.
-  virtual void DumpNetworks(bool include_ignored) {}
-
   struct Stats {
     int ipv4_network_count;
     int ipv6_network_count;
@@ -195,8 +194,7 @@ class BasicNetworkManager : public NetworkManagerBase,
   void StartUpdating() override;
   void StopUpdating() override;
 
-  // Logs the available networks.
-  void DumpNetworks(bool include_ignored) override;
+  void DumpNetworks() override;
 
   // MessageHandler interface.
   void OnMessage(Message* msg) override;
@@ -359,6 +357,11 @@ class Network {
   int preference() const { return preference_; }
   void set_preference(int preference) { preference_ = preference; }
 
+  // A network becomes inactive if it is out of range or it is put into
+  // a dormant state by the OS (to conserve energy).

[pthatcher1, 2015/12/15 08:13:09]

Would it make sense to say something like "when we enumerate networks and find a
network is missing, we do not remove the network.  Instead, we mark it inactive.
 That way, if it returns we know it's an reactived network, not a new network."?

[honghaiz3, 2015/12/15 20:04:53]

Done, with small changes.

+  bool active() const { return active_; }
+  void set_active(bool active) { active_ = active; }
+
   // Debugging description of this network
   std::string ToString() const;
 
@@ -374,6 +377,7 @@ class Network {
   bool ignored_;
   AdapterType type_;
   int preference_;
+  bool active_ = true;
 
   friend class NetworkManager;
 };