diff -r 000000000000 -r 6474c204b198 xpcom/io/nsScriptableInputStream.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/io/nsScriptableInputStream.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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/. */
+
+#ifndef ___nsscriptableinputstream___h_
+#define ___nsscriptableinputstream___h_
+
+#include "nsIScriptableInputStream.h"
+#include "nsIInputStream.h"
+#include "nsCOMPtr.h"
+#include "mozilla/Attributes.h"
+
+#define NS_SCRIPTABLEINPUTSTREAM_CID        \
+{ 0x7225c040, 0xa9bf, 0x11d3, { 0xa1, 0x97, 0x0, 0x50, 0x4, 0x1c, 0xaf, 0x44 } }
+
+#define NS_SCRIPTABLEINPUTSTREAM_CONTRACTID "@mozilla.org/scriptableinputstream;1"
+
+class nsScriptableInputStream MOZ_FINAL : public nsIScriptableInputStream {
+public:
+    // nsISupports methods
+    NS_DECL_ISUPPORTS
+
+    // nsIScriptableInputStream methods
+    NS_DECL_NSISCRIPTABLEINPUTSTREAM
+
+    // nsScriptableInputStream methods
+    nsScriptableInputStream() {}
+
+    static nsresult
+    Create(nsISupports *aOuter, REFNSIID aIID, void **aResult);
+
+private:
+    ~nsScriptableInputStream() {}
+
+    nsresult ReadHelper(char* aBuffer, uint32_t aCount);
+
+    nsCOMPtr<nsIInputStream> mInputStream;
+};
+
+#endif // ___nsscriptableinputstream___h_