FAsyncStreamDerivedChunkWorker ( const [FString](API\Runtime\Core\Containers\FString) & InDerivedDataKey, void * InDestChunkData, int32 InChunkSize, [FThreadSafeCounter](API\Runtime\Core\HAL\FThreadSafeCounter) * InThreadSafeCounter, [TFunction](API\Runtime\Core\GenericPlatform\TFunction)< void(bool)> InOnLoadComplete )