IDL: Generate union type containers

Source/bindings/tests/idls/core/TestObject.idl

Index: Source/bindings/tests/idls/core/TestObject.idl
diff --git a/Source/bindings/tests/idls/core/TestObject.idl b/Source/bindings/tests/idls/core/TestObject.idl
index 34a3066021ed694596c1a2176a5698b21527d7f9..b5bdd26957e8b077b7416f6d64102f8167220253 100644
--- a/Source/bindings/tests/idls/core/TestObject.idl
+++ b/Source/bindings/tests/idls/core/TestObject.idl
@@ -352,7 +352,8 @@ interface TestObject {
     // Union types
     (TestInterfaceGarbageCollected or DOMString) testInterfaceGarbageCollectedOrDOMStringMethod();
     (TestInterfaceWillBeGarbageCollected or TestDictionary) testInterfaceWillBeGarbageCollectedOrTestDictionaryMethod();
-    (sequence<long> or DOMString[] or unrestricted double) longSequenceOrDOMStringArrayOrUnrestrictedDoubleMethod();
+    (boolean or DOMString or unrestricted double) booleanOrDOMStringOrUnrestrictedDoubleMethod();
+    (TestInterface or long) testInterfaceOrLongMethod();
     // Currently only used on interface type arguments
     void voidMethodTestInterfaceEmptyOrNullArg(TestInterfaceEmpty? nullableTestInterfaceEmptyArg);
     // Callback interface types