[net] Add DNS-related signals and NetLog to NetworkChangeNotifier.

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_ANDROID)
@@ skipping 20 matching lines @@
   virtual bool IsCurrentlyOffline() const { return false; }
 };
 
 }  // namespace
 
 NetworkChangeNotifier::~NetworkChangeNotifier() {
   DCHECK_EQ(this, g_network_change_notifier);
   g_network_change_notifier = NULL;
 }
 
+bool NetworkChangeNotifier::IsCurrentlyWatchingDNS() const {
+  return false;
+}
+
 // static
 void NetworkChangeNotifier::SetFactory(
     NetworkChangeNotifierFactory* factory) {
   CHECK(!g_network_change_notifier_factory);
   g_network_change_notifier_factory = factory;
 }
 
 // static
 NetworkChangeNotifier* NetworkChangeNotifier::Create() {
   if (g_network_change_notifier_factory)
@@ skipping 18 matching lines @@
 #endif
 }
 
 // static
 bool NetworkChangeNotifier::IsOffline() {
   return g_network_change_notifier &&
          g_network_change_notifier->IsCurrentlyOffline();
 }
 
 // static
+bool NetworkChangeNotifier::IsWatchingDNS() {
+  return g_network_change_notifier &&
+         g_network_change_notifier->IsCurrentlyWatchingDNS();
+}
+
+// static
 NetworkChangeNotifier* NetworkChangeNotifier::CreateMock() {
   return new MockNetworkChangeNotifier();
 }
 
 void NetworkChangeNotifier::AddIPAddressObserver(IPAddressObserver* observer) {
   if (g_network_change_notifier)
     g_network_change_notifier->ip_address_observer_list_->AddObserver(observer);
 }
 
 void NetworkChangeNotifier::AddOnlineStateObserver(
@@ skipping 74 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