stateAttributeGetter()

static void stateAttributeGetter(const v8::FunctionCallbackInfo<v8::Value>& info)
{
    v8::Local<v8::Object> holder = info.Holder();
    v8::Local<v8::String> propertyName = v8AtomicString(info.GetIsolate(), "state");
    History* impl = V8History::toImpl(holder);
    if (!impl->stateChanged()) {
        v8::Local<v8::Value> v8Value = V8HiddenValue::getHiddenValue(info.GetIsolate(), holder, propertyName);
        if (!v8Value.IsEmpty()) {
            v8SetReturnValue(info, v8Value);
            return;
        }
    }
    RefPtr<SerializedScriptValue> cppValue(impl->state());
    v8::Local<v8::Value> v8Value(cppValue ? cppValue->deserialize() : v8::Local<v8::Value>(v8::Null(info.GetIsolate())));
    V8HiddenValue::setHiddenValue(info.GetIsolate(), holder, propertyName, v8Value);
    v8SetReturnValue(info, v8Value);
}