Compute and check members for serialization

tests/compiler/dart2js/serialization/test_helper.dart

Index: tests/compiler/dart2js/serialization/test_helper.dart
diff --git a/tests/compiler/dart2js/serialization/test_helper.dart b/tests/compiler/dart2js/serialization/test_helper.dart
index dca85531e2ee554889705c4b722f2db8216771cf..4bbed39b8c73b51b0eea69ad24bcd08f5000006b 100644
--- a/tests/compiler/dart2js/serialization/test_helper.dart
+++ b/tests/compiler/dart2js/serialization/test_helper.dart
@@ -339,6 +339,15 @@ void checkLoadedLibraryMembers(
       ClassElement class2 = member2;
       if (!class1.isResolved) return;
 
+      if (hasProperty(member1)) {
+        if (areElementsEquivalent(member1, member2)) {
+          checkMemberProperties(
+              compiler1, member1,
+              compiler2, member2,
+              verbose: verbose);
+        }
+      }
+
       class1.forEachLocalMember((m1) {
         checkMembers(m1, class2.localLookup(m1.name));
       });