public IEnumerator WaitForAsyncOperation(AsyncOperation asyncOperation, OnProgressDelegate onProgress = null)
 {
     return(context.WaitForAsyncOperation(asyncOperation, onProgress));
 }
 public IEnumerator WaitForAsyncOperation(AsyncOperation asyncOperation, System.Action <float> onProgress = null)
 {
     return(context.WaitForAsyncOperation(asyncOperation, onProgress));
 }