Internal change

PiperOrigin-RevId: 468331059
diff --git a/build/source_list.gni b/build/source_list.gni
index 842512d..e06888f 100644
--- a/build/source_list.gni
+++ b/build/source_list.gni
@@ -778,6 +778,7 @@
     "src/quiche/quic/test_tools/first_flight.h",
     "src/quiche/quic/test_tools/limited_mtu_test_writer.h",
     "src/quiche/quic/test_tools/mock_clock.h",
+    "src/quiche/quic/test_tools/mock_connection_id_generator.h",
     "src/quiche/quic/test_tools/mock_quic_client_promised_info.h",
     "src/quiche/quic/test_tools/mock_quic_dispatcher.h",
     "src/quiche/quic/test_tools/mock_quic_session_visitor.h",