IDL: Don't lose nullable flag when "preprocessing" type

Source/bindings/tests/results/core/V8TestObject.cpp

Index: Source/bindings/tests/results/core/V8TestObject.cpp
diff --git a/Source/bindings/tests/results/core/V8TestObject.cpp b/Source/bindings/tests/results/core/V8TestObject.cpp
index 3ff8e5b94bb55a88876ff058ab41b82a42ac396d..a3ba32d82d31f308cf7672c113d4d6913f0bc769 100644
--- a/Source/bindings/tests/results/core/V8TestObject.cpp
+++ b/Source/bindings/tests/results/core/V8TestObject.cpp
@@ -1655,6 +1655,38 @@ static void testEnumAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
+static void testEnumOrNullAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    v8::Local<v8::Object> holder = info.Holder();
+    TestObject* impl = V8TestObject::toImpl(holder);
+    v8SetReturnValueStringOrNull(info, impl->testEnumOrNullAttribute(), info.GetIsolate());
+}
+
+static void testEnumOrNullAttributeAttributeGetterCallback(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
+    TestObjectV8Internal::testEnumOrNullAttributeAttributeGetter(info);
+    TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
+}
+
+static void testEnumOrNullAttributeAttributeSetter(v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
+{
+    v8::Local<v8::Object> holder = info.Holder();
+    TestObject* impl = V8TestObject::toImpl(holder);
+    TOSTRING_VOID(V8StringResource<TreatNullAsNullString>, cppValue, v8Value);
+    String string = cppValue;
+    if (!(string == "" || string == "EnumValue1" || string == "EnumValue2" || string == "EnumValue3"))
+        return;
+    impl->setTestEnumOrNullAttribute(cppValue);
+}
+
+static void testEnumOrNullAttributeAttributeSetterCallback(v8::Local<v8::String>, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info)
+{
+    TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMSetter");
+    TestObjectV8Internal::testEnumOrNullAttributeAttributeSetter(v8Value, info);
+    TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
+}
+
 static void staticStringAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8SetReturnValueString(info, TestObject::staticStringAttribute(), info.GetIsolate());
@@ -11050,6 +11082,7 @@ static const V8DOMConfiguration::AttributeConfiguration V8TestObjectAttributes[]
     {"longOrNullAttribute", TestObjectV8Internal::longOrNullAttributeAttributeGetterCallback, TestObjectV8Internal::longOrNullAttributeAttributeSetterCallback, 0, 0, 0, static_cast<v8::AccessControl>(v8::DEFAULT), static_cast<v8::PropertyAttribute>(v8::None), V8DOMConfiguration::ExposedToAllScripts, V8DOMConfiguration::OnInstance},
     {"testInterfaceOrNullAttribute", TestObjectV8Internal::testInterfaceOrNullAttributeAttributeGetterCallback, TestObjectV8Internal::testInterfaceOrNullAttributeAttributeSetterCallback, 0, 0, 0, static_cast<v8::AccessControl>(v8::DEFAULT), static_cast<v8::PropertyAttribute>(v8::None), V8DOMConfiguration::ExposedToAllScripts, V8DOMConfiguration::OnInstance},
     {"testEnumAttribute", TestObjectV8Internal::testEnumAttributeAttributeGetterCallback, TestObjectV8Internal::testEnumAttributeAttributeSetterCallback, 0, 0, 0, static_cast<v8::AccessControl>(v8::DEFAULT), static_cast<v8::PropertyAttribute>(v8::None), V8DOMConfiguration::ExposedToAllScripts, V8DOMConfiguration::OnInstance},
+    {"testEnumOrNullAttribute", TestObjectV8Internal::testEnumOrNullAttributeAttributeGetterCallback, TestObjectV8Internal::testEnumOrNullAttributeAttributeSetterCallback, 0, 0, 0, static_cast<v8::AccessControl>(v8::DEFAULT), static_cast<v8::PropertyAttribute>(v8::None), V8DOMConfiguration::ExposedToAllScripts, V8DOMConfiguration::OnInstance},
     {"eventHandlerAttribute", TestObjectV8Internal::eventHandlerAttributeAttributeGetterCallback, TestObjectV8Internal::eventHandlerAttributeAttributeSetterCallback, 0, 0, 0, static_cast<v8::AccessControl>(v8::DEFAULT), static_cast<v8::PropertyAttribute>(v8::None), V8DOMConfiguration::ExposedToAllScripts, V8DOMConfiguration::OnInstance},
     {"doubleOrStringAttribute", TestObjectV8Internal::doubleOrStringAttributeAttributeGetterCallback, TestObjectV8Internal::doubleOrStringAttributeAttributeSetterCallback, 0, 0, 0, static_cast<v8::AccessControl>(v8::DEFAULT), static_cast<v8::PropertyAttribute>(v8::None), V8DOMConfiguration::ExposedToAllScripts, V8DOMConfiguration::OnInstance},
     {"doubleOrStringOrNullAttribute", TestObjectV8Internal::doubleOrStringOrNullAttributeAttributeGetterCallback, TestObjectV8Internal::doubleOrStringOrNullAttributeAttributeSetterCallback, 0, 0, 0, static_cast<v8::AccessControl>(v8::DEFAULT), static_cast<v8::PropertyAttribute>(v8::None), V8DOMConfiguration::ExposedToAllScripts, V8DOMConfiguration::OnInstance},