Expose connection subtype from NetworkChangeNotifier

net/base/network_change_notifier.cc

Index: net/base/network_change_notifier.cc
diff --git a/net/base/network_change_notifier.cc b/net/base/network_change_notifier.cc
index 0cfaaa38d259db9be27343bf487aaf3b88d1a6a0..f5bfa8cbf5e281cdbd97f545fd3c8a7478078b3c 100644
--- a/net/base/network_change_notifier.cc
+++ b/net/base/network_change_notifier.cc
@@ -547,6 +547,14 @@ NetworkChangeNotifier::GetConnectionType() {
 }
 
 // static
+NetworkChangeNotifier::ConnectionSubtype
+NetworkChangeNotifier::GetConnectionSubtype() {
+  return g_network_change_notifier
+             ? g_network_change_notifier->GetCurrentConnectionSubtype()
+             : SUBTYPE_UNKNOWN;
+}
+
+// static
 void NetworkChangeNotifier::GetMaxBandwidthAndConnectionType(
     double* max_bandwidth_mbps,
     ConnectionType* connection_type) {
@@ -985,6 +993,11 @@ NetworkChangeNotifier::GetAddressTrackerInternal() const {
 }
 #endif
 
+NetworkChangeNotifier::ConnectionSubtype
+NetworkChangeNotifier::GetCurrentConnectionSubtype() const {
+  return SUBTYPE_UNKNOWN;
+}
+
 void NetworkChangeNotifier::GetCurrentMaxBandwidthAndConnectionType(
     double* max_bandwidth_mbps,
     ConnectionType* connection_type) const {