Add smoke test for gstatic resources (#123270)

dev/bots/test.dart

@@ -1135,6 +1135,7 @@ Future<void> _runWebUnitTests(String webRenderer) async {
 
 /// Coarse-grained integration tests running on the Web.
 Future<void> _runWebLongRunningTests() async {
+  final String engineVersion = File(engineVersionFile).readAsStringSync().trim();
   final List<ShardRunner> tests = <ShardRunner>[
     for (String buildMode in _kAllBuildModes) ...<ShardRunner>[
       () => _runFlutterDriverWebTest(
@@ -1228,6 +1229,10 @@ Future<void> _runWebLongRunningTests() async {
     () => _runWebDebugTest('lib/stack_trace.dart'),
     () => _runWebDebugTest('lib/framework_stack_trace.dart'),
     () => _runWebDebugTest('lib/web_directory_loading.dart'),
+    () => _runWebDebugTest('lib/web_resources_cdn_test.dart',
+      additionalArguments: <String>[
+        '--dart-define=TEST_FLUTTER_ENGINE_VERSION=$engineVersion',
+      ]),
     () => _runWebDebugTest('test/test.dart'),
     () => _runWebDebugTest('lib/null_safe_main.dart', enableNullSafety: true),
     () => _runWebDebugTest('lib/web_define_loading.dart',

dev/integration_tests/web/lib/web_resources_cdn_test.dart

+// 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 ---');
+  }
+}