[net] Adds AddressTrackerLinux which keeps track of interface addresses using rtnetlink.

net/base/network_change_notifier.cc

 // Copyright (c) 2012 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.
 
 #include "net/base/network_change_notifier.h"
 #include "net/base/network_change_notifier_factory.h"
 #include "build/build_config.h"
 #if defined(OS_WIN)
 #include "net/base/network_change_notifier_win.h"
 #elif defined(OS_LINUX) && !defined(OS_CHROMEOS)
@@ skipping 66 matching lines @@
 }
 
 // static
 NetworkChangeNotifier::ConnectionType
 NetworkChangeNotifier::GetConnectionType() {
   return g_network_change_notifier ?
       g_network_change_notifier->GetCurrentConnectionType() :
       CONNECTION_UNKNOWN;
 }
 
+#if defined(OS_LINUX)
+// static
+const internal::AddressTrackerLinux*
+NetworkChangeNotifier::GetAddressTracker() {
+  return g_network_change_notifier ?
+        g_network_change_notifier->GetAddressTrackerInternal() : NULL;
+}
+#endif
+
 // static
 bool NetworkChangeNotifier::IsWatchingDNS() {
   if (!g_network_change_notifier)
     return false;
   base::AutoLock lock(g_network_change_notifier->watching_dns_lock_);
   return g_network_change_notifier->watching_dns_;
 }
 
 // static
 NetworkChangeNotifier* NetworkChangeNotifier::CreateMock() {
@@ skipping 51 matching lines @@
         new ObserverListThreadSafe<ConnectionTypeObserver>(
             ObserverListBase<ConnectionTypeObserver>::NOTIFY_EXISTING_ONLY)),
       resolver_state_observer_list_(
         new ObserverListThreadSafe<DNSObserver>(
             ObserverListBase<DNSObserver>::NOTIFY_EXISTING_ONLY)),
       watching_dns_(false) {
   DCHECK(!g_network_change_notifier);
   g_network_change_notifier = this;
 }
 
+#if defined(OS_LINUX)
+const internal::AddressTrackerLinux*
+NetworkChangeNotifier::GetAddressTrackerInternal() const {
+  return NULL;
+}
+#endif
+
 // static
 void NetworkChangeNotifier::NotifyObserversOfIPAddressChange() {
   if (g_network_change_notifier) {
     g_network_change_notifier->ip_address_observer_list_->Notify(
         &IPAddressObserver::OnIPAddressChanged);
   }
 }
 
 // static
 void NetworkChangeNotifier::NotifyObserversOfDNSChange(unsigned detail) {
@@ skipping 29 matching lines @@
   DCHECK(g_network_change_notifier);
   g_network_change_notifier = NULL;
 }
 
 NetworkChangeNotifier::DisableForTest::~DisableForTest() {
   DCHECK(!g_network_change_notifier);
   g_network_change_notifier = network_change_notifier_;
 }
 
 }  // namespace net