Handle html+mirrors

tests/compiler/dart2js/serialization/test_data.dart

Index: tests/compiler/dart2js/serialization/test_data.dart
diff --git a/tests/compiler/dart2js/serialization/test_data.dart b/tests/compiler/dart2js/serialization/test_data.dart
index 9038877f5892e9dac54446ff2ab449b58dce82e6..d4b8434890500326b45983beaef5418739c185a4 100644
--- a/tests/compiler/dart2js/serialization/test_data.dart
+++ b/tests/compiler/dart2js/serialization/test_data.dart
@@ -762,6 +762,15 @@ var foo;
         'b.dart': '''
 var foo;
 ''',}),
+
+  const Test('html and mirrors', const {},
+      preserializedSourceFiles: const {
+        'main.dart': '''
+import 'dart:html';
+import 'dart:mirrors';
+main() {}
+'''},
+      expectedWarningCount: 1),
 ];
 
 class Test {