diff -r 000000000000 -r 6474c204b198 xpcom/io/nsIOUtil.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/io/nsIOUtil.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIOUtil.h"
+#include "nsIInputStream.h"
+#include "nsIOutputStream.h"
+#include "nsStreamUtils.h"
+
+NS_IMPL_ISUPPORTS(nsIOUtil, nsIIOUtil)
+
+NS_IMETHODIMP
+nsIOUtil::InputStreamIsBuffered(nsIInputStream* aStream, bool* _retval)
+{
+  if (NS_WARN_IF(!aStream))
+    return NS_ERROR_INVALID_ARG;
+  *_retval = NS_InputStreamIsBuffered(aStream);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsIOUtil::OutputStreamIsBuffered(nsIOutputStream* aStream, bool* _retval)
+{
+  if (NS_WARN_IF(!aStream))
+    return NS_ERROR_INVALID_ARG;
+  *_retval = NS_OutputStreamIsBuffered(aStream);
+  return NS_OK;
+}