Add smoke test for gstatic resources (#123270)

dev/integration_tests/web/lib/web_resources_cdn_test.dart

@@ -0,0 +1,44 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:html' as html;
+
+// Attempt to load CanvasKit resources hosted on gstatic.
+Future<void> main() async {
+  const String engineVersion = String.fromEnvironment('TEST_FLUTTER_ENGINE_VERSION');
+  if (engineVersion.isEmpty) {
+    print('--- TEST FAILED ---');
+    return;
+  }
+  try {
+    final html.HttpRequest request = await html.HttpRequest.request(
+      'https://www.gstatic.com/flutter-canvaskit/$engineVersion/canvaskit.js',
+      method: 'GET',
+    );
+    final dynamic response = request.response;
+    if (response != null) {
+      print('--- TEST SUCCEEDED ---');
+    } else {
+      print('--- TEST FAILED ---');
+    }
+  } catch (err) {
+    print(err);
+    print('--- TEST FAILED ---');
+  }
+  try {
+    final html.HttpRequest request = await html.HttpRequest.request(
+      'https://www.gstatic.com/flutter-canvaskit/$engineVersion/canvaskit.wasm',
+      method: 'GET',
+    );
+    final dynamic response = request.response;
+    if (response != null) {
+      print('--- TEST SUCCEEDED ---');
+    } else {
+      print('--- TEST FAILED ---');
+    }
+  } catch (err) {
+    print(err);
+    print('--- TEST FAILED ---');
+  }
+}