Add NetworkChangeNotifier connectivity events to the NetLog.

net/base/net_log_event_type_list.h

Index: net/base/net_log_event_type_list.h
diff --git a/net/base/net_log_event_type_list.h b/net/base/net_log_event_type_list.h
index 4003d9bbccb882aacddc67007f47d1d6413e03ff..d28f6ea4e1c9a72c4f108d669445e86449257318 100644
--- a/net/base/net_log_event_type_list.h
+++ b/net/base/net_log_event_type_list.h
@@ -1293,10 +1293,17 @@ EVENT_TYPE(APPCACHE_DELIVERING_ERROR_RESPONSE)
 // These are events which are not grouped by source id, as they have no
 // context.
 
-// This event is emitted whenever NetworkChangeNotifier determines that the
-// underlying network has changed.
+// This event is emitted whenever NetworkChangeNotifier determines that an
+// active network adapter's IP address has changed.
 EVENT_TYPE(NETWORK_IP_ADDRESSES_CHANGED)
 
+// This event is emitted whenever NetworkChangeNotifier determines that an
+// active network adapter's connectivity status has changed.
+//   {
+//     "new_connection_type": <Type of the new connection>
+//   }
+EVENT_TYPE(NETWORK_CONNECTIVITY_CHANGED)
+
 
 // This event is emitted whenever HostResolverImpl receives a new DnsConfig
 // from the DnsConfigService.