NetworkChangeNotifierChromeos: Handle IPConfig property changes on the default network

chromeos/network/network_state.h

Index: chromeos/network/network_state.h
diff --git a/chromeos/network/network_state.h b/chromeos/network/network_state.h
index 6e7890b93bad5dff04b1d6549cdce8de24839a3f..fafe23060d772ebcfc5c652fdd46bf8daaea6d04 100644
--- a/chromeos/network/network_state.h
+++ b/chromeos/network/network_state.h
@@ -36,6 +36,7 @@ class CHROMEOS_EXPORT NetworkState : public ManagedState {
   // Accessors
   const std::string& security() const { return security_; }
   const std::string& ip_address() const { return ip_address_; }
+  const std::string& dns_servers() const { return dns_servers_; }
   const std::string& device_path() const { return device_path_; }
   const std::string& guid() const { return guid_; }
   const std::string& connection_state() const { return connection_state_; }
@@ -66,12 +67,16 @@ class CHROMEOS_EXPORT NetworkState : public ManagedState {
   void set_ip_address(const std::string& ip_address) {
     ip_address_ = ip_address;
   }
+  void set_dns_servers(const std::string& dns_servers) {
+    dns_servers_ = dns_servers;
+  }
 
   // Common Network Service properties
   std::string security_;
   std::string device_path_;
   std::string guid_;
   std::string ip_address_;
+  std::string dns_servers_;
   std::string connection_state_;
   std::string error_;
   // Wireless properties