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 995982417ec37faa1b87131ce118b853576451c1..d43def68b30af8dbca3e37a8db5f7f3672e7e18c 100644
--- a/chromeos/network/network_state.h
+++ b/chromeos/network/network_state.h
@@ -5,6 +5,9 @@
 #ifndef CHROMEOS_NETWORK_NETWORK_STATE_H_
 #define CHROMEOS_NETWORK_NETWORK_STATE_H_
 
+#include <string>
+#include <vector>
+
 #include "chromeos/network/managed_state.h"
 
 namespace base {
@@ -36,6 +39,7 @@ 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::vector<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_; }
@@ -61,6 +65,10 @@ class CHROMEOS_EXPORT NetworkState : public ManagedState {
   static bool StateIsConnected(const std::string& connection_state);
   static bool StateIsConnecting(const std::string& connection_state);
 
+  // Helper to return a full prefixed version of an IPConfig property
+  // key.
+  static std::string IPConfigProperty(const char* key);
+
  private:
   friend class NetworkStateHandler;
   friend class NetworkChangeNotifierChromeosUpdateTest;
@@ -69,17 +77,24 @@ 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::vector<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 connection_state_;
   std::string error_;
   bool auto_connect_;
   bool favorite_;
   int priority_;
+  // IPConfig properties.
+  // Note: These do not correspond to actual Shill.Service properties
+  // but are derived from the service's corresponding IPConfig object.
+  std::string ip_address_;
+  std::vector<std::string> dns_servers_;
   // Wireless properties
   int signal_strength_;
   // Cellular properties