fix #603, support mock objects

test/codegen_expected/language/override_inheritance_no_such_method_test_13_multi.js

Index: test/codegen_expected/language/override_inheritance_no_such_method_test_13_multi.js
diff --git a/test/codegen_expected/language/override_inheritance_no_such_method_test_13_multi.js b/test/codegen_expected/language/override_inheritance_no_such_method_test_13_multi.js
index e7ad885bdffa2788b84a19e98313a7e4ca0b2c4d..4c364f94c89327eacc37d6157755993baacd1774 100644
--- a/test/codegen_expected/language/override_inheritance_no_such_method_test_13_multi.js
+++ b/test/codegen_expected/language/override_inheritance_no_such_method_test_13_multi.js
@@ -15,8 +15,15 @@ dart_library.library('language/override_inheritance_no_such_method_test_13_multi
     noSuchMethod(_) {
       return null;
     }
+    method13() {
+      return this.noSuchMethod(new dart.InvocationImpl('method13', [], {isMethod: true}));
+    }
+  };
+  override_inheritance_no_such_method_test_13_multi.Class2 = class Class2 extends override_inheritance_no_such_method_test_13_multi.B {
+    method13() {
+      return this.noSuchMethod(new dart.InvocationImpl('method13', [], {isMethod: true}));
+    }
   };
-  override_inheritance_no_such_method_test_13_multi.Class2 = class Class2 extends override_inheritance_no_such_method_test_13_multi.B {};
   override_inheritance_no_such_method_test_13_multi.main = function() {
     new override_inheritance_no_such_method_test_13_multi.Class1();
     new override_inheritance_no_such_method_test_13_multi.Class2();