Revert "Remove unused option in server API"

pkg/analysis_server/test/test_all.dart

Index: pkg/analysis_server/test/test_all.dart
diff --git a/pkg/analysis_server/test/test_all.dart b/pkg/analysis_server/test/test_all.dart
index 4f4ee7202ba743214b4b60d310eb57f42be60f92..e830864d074be011e1261fa1f58b7cb5a291687e 100644
--- a/pkg/analysis_server/test/test_all.dart
+++ b/pkg/analysis_server/test/test_all.dart
@@ -24,6 +24,7 @@ import 'server_options_test.dart' as server_options;
 import 'services/test_all.dart' as services_all;
 import 'single_context_manager_test.dart' as single_context_manager_test;
 import 'socket_server_test.dart' as socket_server_test;
+import 'source/test_all.dart' as source_all;
 import 'src/test_all.dart' as src_all;
 import 'utils.dart';
 
@@ -53,6 +54,7 @@ main() {
     services_all.main();
     single_context_manager_test.main();
     socket_server_test.main();
+    source_all.main();
     src_all.main();
   });
 }