Make HostResolverImpl log resolved addresses when reading from cache or hosts file

net/log/net_log_event_type_list.h

Index: net/log/net_log_event_type_list.h
diff --git a/net/log/net_log_event_type_list.h b/net/log/net_log_event_type_list.h
index 0a844474a7c6faca09e12b3c97a3a826e47ca2b0..ed6a0c897eaf1ab4f04a18a9db7a54e21f7cdece 100644
--- a/net/log/net_log_event_type_list.h
+++ b/net/log/net_log_event_type_list.h
@@ -64,9 +64,17 @@ EVENT_TYPE(HOST_RESOLVER_IMPL_REQUEST)
 EVENT_TYPE(HOST_RESOLVER_IMPL_IPV6_REACHABILITY_CHECK)
 
 // This event is logged when a request is handled by a cache entry.
+// It contains the following parameter:
+//   {
+//     "address_list": <The resolved addresses>,
+//   }
 EVENT_TYPE(HOST_RESOLVER_IMPL_CACHE_HIT)
 
 // This event is logged when a request is handled by a HOSTS entry.
+// It contains the following parameter:
+//   {
+//     "address_list": <The resolved addresses>,
+//   }
 EVENT_TYPE(HOST_RESOLVER_IMPL_HOSTS_HIT)
 
 // This event is created when a new HostResolverImpl::Job is about to be created