diff -r 000000000000 -r 6474c204b198 dom/ipc/StructuredCloneUtils.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/ipc/StructuredCloneUtils.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,58 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim: set sw=4 ts=8 et tw=80 : */
+/* 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 mozilla_dom_StructuredCloneUtils_h
+#define mozilla_dom_StructuredCloneUtils_h
+
+#include "nsCOMPtr.h"
+#include "nsTArray.h"
+#include "nsIDOMFile.h"
+
+#include "js/StructuredClone.h"
+
+namespace mozilla {
+
+struct SerializedStructuredCloneBuffer;
+
+namespace dom {
+
+struct
+StructuredCloneClosure
+{
+  nsTArray<nsCOMPtr<nsIDOMBlob> > mBlobs;
+};
+
+struct
+StructuredCloneData
+{
+  StructuredCloneData() : mData(nullptr), mDataLength(0) {}
+  uint64_t* mData;
+  size_t mDataLength;
+  StructuredCloneClosure mClosure;
+};
+
+bool
+ReadStructuredClone(JSContext* aCx, uint64_t* aData, size_t aDataLength,
+                    const StructuredCloneClosure& aClosure,
+                    JS::MutableHandle<JS::Value> aClone);
+
+inline bool
+ReadStructuredClone(JSContext* aCx, const StructuredCloneData& aData,
+                    JS::MutableHandle<JS::Value> aClone)
+{
+  return ReadStructuredClone(aCx, aData.mData, aData.mDataLength,
+                             aData.mClosure, aClone);
+}
+
+bool
+WriteStructuredClone(JSContext* aCx, JS::Handle<JS::Value> aSource,
+                     JSAutoStructuredCloneBuffer& aBuffer,
+                     StructuredCloneClosure& aClosure);
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_StructuredCloneUtils_h