IDL union: nullable support

Source/bindings/tests/results/core/UnionTypesCore.h

Index: Source/bindings/tests/results/core/UnionTypesCore.h
diff --git a/Source/bindings/tests/results/core/UnionTypesCore.h b/Source/bindings/tests/results/core/UnionTypesCore.h
index bd364dd5191492c8fe4b08e9f7ffd7bc0418d917..abe6fda1ec56786224046ac2d7dc8771b40e6b28 100644
--- a/Source/bindings/tests/results/core/UnionTypesCore.h
+++ b/Source/bindings/tests/results/core/UnionTypesCore.h
@@ -410,6 +410,16 @@ inline void v8SetReturnValue(const CallbackInfo& callbackInfo, TestInterfaceWill
     v8SetReturnValue(callbackInfo, toV8(impl, callbackInfo.Holder(), callbackInfo.GetIsolate()));
 }
 
+class V8DoubleOrStringOrNull final {
+public:
+    static void toImpl(v8::Isolate* isolate, v8::Handle<v8::Value> v8Value, DoubleOrString& impl, ExceptionState& exceptionState)
+    {
+        if (isUndefinedOrNull(v8Value))
+            return;
+        V8DoubleOrString::toImpl(isolate, v8Value, impl, exceptionState);
+    }
+};
+
 } // namespace blink
 
 #endif // UnionTypeCore_h