Pass FROM_HERE to ObserverListThreadSafe::Notify to improve profile.

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 <limits>
 
 #include "base/metrics/histogram.h"
 #include "base/synchronization/lock.h"
@@ skipping 931 matching lines @@
 
 // static
 void NetworkChangeNotifier::SetDnsConfig(const DnsConfig& config) {
   if (!g_network_change_notifier)
     return;
   g_network_change_notifier->network_state_->SetDnsConfig(config);
   NotifyObserversOfDNSChange();
 }
 
 void NetworkChangeNotifier::NotifyObserversOfIPAddressChangeImpl() {
-  ip_address_observer_list_->Notify(&IPAddressObserver::OnIPAddressChanged);
+  ip_address_observer_list_->Notify(FROM_HERE,
+                                    &IPAddressObserver::OnIPAddressChanged);
 }
 
 void NetworkChangeNotifier::NotifyObserversOfConnectionTypeChangeImpl(
     ConnectionType type) {
   connection_type_observer_list_->Notify(
-      &ConnectionTypeObserver::OnConnectionTypeChanged, type);
+      FROM_HERE, &ConnectionTypeObserver::OnConnectionTypeChanged, type);
 }
 
 void NetworkChangeNotifier::NotifyObserversOfNetworkChangeImpl(
     ConnectionType type) {
   network_change_observer_list_->Notify(
-      &NetworkChangeObserver::OnNetworkChanged, type);
+      FROM_HERE, &NetworkChangeObserver::OnNetworkChanged, type);
 }
 
 void NetworkChangeNotifier::NotifyObserversOfDNSChangeImpl() {
-  resolver_state_observer_list_->Notify(&DNSObserver::OnDNSChanged);
+  resolver_state_observer_list_->Notify(FROM_HERE, &DNSObserver::OnDNSChanged);
 }
 
 void NetworkChangeNotifier::NotifyObserversOfMaxBandwidthChangeImpl(
     double max_bandwidth_mbps) {
   max_bandwidth_observer_list_->Notify(
-      &MaxBandwidthObserver::OnMaxBandwidthChanged, max_bandwidth_mbps);
+      FROM_HERE, &MaxBandwidthObserver::OnMaxBandwidthChanged,
+      max_bandwidth_mbps);
 }
 
 NetworkChangeNotifier::DisableForTest::DisableForTest()
     : network_change_notifier_(g_network_change_notifier) {
   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