diff -r 000000000000 -r 6474c204b198 layout/xul/nsPIListBoxObject.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/nsPIListBoxObject.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+/* -*- 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/. */
+
+#ifndef nsPIListBoxObject_h__
+#define nsPIListBoxObject_h__
+
+class nsListBoxBodyFrame;
+
+// fa9549f7-ee09-48fc-89f7-30cceee21c15
+#define NS_PILISTBOXOBJECT_IID \
+{ 0xfa9549f7, 0xee09, 0x48fc, \
+  { 0x89, 0xf7, 0x30, 0xcc, 0xee, 0xe2, 0x1c, 0x15 } }
+
+#include "nsIListBoxObject.h"
+
+class nsPIListBoxObject : public nsIListBoxObject {
+ public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_PILISTBOXOBJECT_IID)
+  /**
+   * Get the list box body.  This will search for it as needed.
+   * If aFlush is false we don't Flush_Frames though.
+   */
+  virtual nsListBoxBodyFrame* GetListBoxBody(bool aFlush) = 0;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsPIListBoxObject, NS_PILISTBOXOBJECT_IID)
+
+#endif // nsPIListBoxObject_h__