Label IPv6 reachability checks in NetLog

net/dns/host_resolver_impl.cc

Index: net/dns/host_resolver_impl.cc
diff --git a/net/dns/host_resolver_impl.cc b/net/dns/host_resolver_impl.cc
index f90df0463afdf9a89dd2b9825a7b83dd4b8973ef..a1ab0e5b9b4f54bf12e65ee4e91e40b1b5a2f160 100644
--- a/net/dns/host_resolver_impl.cc
+++ b/net/dns/host_resolver_impl.cc
@@ -2155,7 +2155,12 @@ HostResolverImpl::Key HostResolverImpl::GetEffectiveKeyForRequest(
             0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x88, 0x88 };
       IPAddressNumber address(kIPv6Address,
                               kIPv6Address + arraysize(kIPv6Address));
-      bool rv6 = IsGloballyReachable(address, net_log);
+      BoundNetLog probe_net_log = BoundNetLog::Make(
+          net_log.net_log(), NetLog::SOURCE_IPV6_REACHABILITY_CHECK);
+      probe_net_log.BeginEvent(NetLog::TYPE_IPV6_REACHABILITY_CHECK,
+                               net_log.source().ToEventParametersCallback());
+      bool rv6 = IsGloballyReachable(address, probe_net_log);
+      probe_net_log.EndEvent(NetLog::TYPE_IPV6_REACHABILITY_CHECK);
       if (rv6)
         net_log.AddEvent(NetLog::TYPE_HOST_RESOLVER_IMPL_IPV6_SUPPORTED);