[dart2wasm] Add FluteComplex multi-module stress test.

Change-Id: I2b13649d67d5b68211b6c15c745fd194773b9e7f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/386380
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Nate Biggs <natebiggs@google.com>

tests/web/wasm/flute_stress_test.dart

@@ -0,0 +1,24 @@
+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// dart2wasmOptions=--extra-compiler-option=--enable-multi-module-stress-test-mode
+
+import 'dart:async';
+
+import 'package:async_helper/async_helper.dart';
+import '../../../third_party/flute/benchmarks/lib/complex.dart' as flute;
+
+main() {
+  asyncStart();
+  int frames = 0;
+  runZoned(() {
+    final startTime = '${DateTime.now().microsecondsSinceEpoch / 1000000}';
+    flute.main([startTime, '10']);
+  }, zoneSpecification: ZoneSpecification(print: (_, parent, zone, line) {
+    parent.print(zone, line);
+    if (line.contains('AverageFrame')) {
+      asyncEnd();
+    }
+  }));
+}