gfe-relnote: Implement QUIC MTU discovery v2. Protected by --gfe2_reloadable_flag_quic_mtu_discovery_v2.

PiperOrigin-RevId: 274290098
Change-Id: I6a55ff6aced1702fd42841f9a130f4d84076c3ec
diff --git a/quic/test_tools/quic_test_utils.h b/quic/test_tools/quic_test_utils.h
index fbadf13..1cd2683 100644
--- a/quic/test_tools/quic_test_utils.h
+++ b/quic/test_tools/quic_test_utils.h
@@ -1258,6 +1258,10 @@
   return arg.destination_connection_id == destination_connection_id;
 }
 
+MATCHER_P2(InRange, min, max, "") {
+  return arg >= min && arg <= max;
+}
+
 }  // namespace test
 }  // namespace quic