[net/dns] Handle TC bit on DNS response in DnsTransaction.

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 776efd216a067fe6c166e04603390c90a1d47a29..54697a2115f7c5eb4b5c11e8237f05f77edcffaa 100644
--- a/net/base/net_log_event_type_list.h
+++ b/net/base/net_log_event_type_list.h
@@ -1399,6 +1399,17 @@ EVENT_TYPE(DNS_TRANSACTION_QUERY)
 //   }
 EVENT_TYPE(DNS_TRANSACTION_ATTEMPT)
 
+// This event is created when DnsTransaction creates a new TCP socket and
+// tries to resolve the fully-qualified name.
+//
+// It has a single parameter:
+//
+//   {
+//     "source_dependency": <Source id of the TCP socket created for the
+//                           attempt>,
+//   }
+EVENT_TYPE(DNS_TRANSACTION_TCP_ATTEMPT)
+
 // This event is created when DnsTransaction receives a matching response.
 //
 // It has the following parameters: