diff -r 000000000000 -r 6474c204b198 dom/interfaces/devicestorage/nsIDOMDeviceStorage.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/devicestorage/nsIDOMDeviceStorage.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,46 @@
+/* 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 "domstubs.idl"
+#include "nsIDOMEventTarget.idl"
+interface nsIDOMBlob;
+interface nsIDOMDOMRequest;
+interface nsIDOMDOMCursor;
+interface nsIDOMDeviceStorageChangeEvent;
+interface nsIDOMEventListener;
+interface nsIFile;
+
+%{C++
+struct DeviceStorageFileDescriptor;
+%}
+[ptr] native DeviceStorageFdPtr(DeviceStorageFileDescriptor);
+
+[scriptable, uuid(8b724547-3c78-4244-969a-f00a1f4ae0c3), builtinclass]
+interface nsIDOMDeviceStorage : nsIDOMEventTarget
+{
+    [implicit_jscontext] attribute jsval onchange;
+    nsIDOMDOMRequest add(in nsIDOMBlob aBlob);
+    nsIDOMDOMRequest addNamed(in nsIDOMBlob aBlob, in DOMString aName);
+
+    nsIDOMDOMRequest get([Null(Stringify)] in DOMString aName);
+    nsIDOMDOMRequest getEditable([Null(Stringify)] in DOMString aName);
+    nsIDOMDOMRequest delete([Null(Stringify)] in DOMString aName);
+
+    nsIDOMDOMRequest freeSpace();
+    nsIDOMDOMRequest usedSpace();
+    nsIDOMDOMRequest available();
+
+    // Note that the storageName is just a name (like sdcard), and doesn't
+    // include any path information.
+    readonly attribute DOMString storageName;
+
+    // Determines if this storage area is the one which will be used by default
+    // for storing new files.
+    readonly attribute bool default;
+
+    // Note: aFileDescriptor is reference counted, which is why we're using
+    //       a pointer rather than a reference.
+    [noscript] nsIDOMDOMRequest createFileDescriptor(in DOMString aName,
+                                                     in DeviceStorageFdPtr aFileDescriptor);
+};