diff -r 000000000000 -r 6474c204b198 dom/interfaces/storage/nsPIDOMStorage.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/storage/nsPIDOMStorage.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,54 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=2 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 __nsPIDOMStorage_h_
+#define __nsPIDOMStorage_h_
+
+#include "nsISupports.h"
+#include "nsString.h"
+#include "nsTArray.h"
+
+class nsIPrincipal;
+
+namespace mozilla {
+namespace dom {
+
+class DOMStorageCache;
+class DOMStorageManager;
+
+} // ::dom
+} // ::mozilla
+
+// {09198A51-5D27-4992-97E4-38A9CEA2A65D}
+#define NS_PIDOMSTORAGE_IID \
+  { 0x9198a51, 0x5d27, 0x4992, \
+    { 0x97, 0xe4, 0x38, 0xa9, 0xce, 0xa2, 0xa6, 0x5d } }
+
+class nsPIDOMStorage : public nsISupports
+{
+public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_PIDOMSTORAGE_IID)
+
+  enum StorageType {
+    LocalStorage = 1,
+    SessionStorage = 2
+  };
+
+  virtual StorageType GetType() const = 0;
+  virtual mozilla::dom::DOMStorageManager* GetManager() const = 0;
+  virtual const mozilla::dom::DOMStorageCache* GetCache() const = 0;
+
+  virtual nsTArray<nsString>* GetKeys() = 0;
+
+  virtual nsIPrincipal* GetPrincipal() = 0;
+  virtual bool PrincipalEquals(nsIPrincipal* principal) = 0;
+  virtual bool CanAccess(nsIPrincipal *aPrincipal) = 0;
+  virtual bool IsPrivate() = 0;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsPIDOMStorage, NS_PIDOMSTORAGE_IID)
+
+#endif // __nsPIDOMStorage_h_