diff -r 000000000000 -r 6474c204b198 layout/xul/tree/nsTreeBoxObject.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/tree/nsTreeBoxObject.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,38 @@
+/* -*- 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 nsTreeBoxObject_h___
+#define nsTreeBoxObject_h___
+
+#include "mozilla/Attributes.h"
+#include "nsBoxObject.h"
+#include "nsITreeView.h"
+#include "nsITreeBoxObject.h"
+
+class nsTreeBodyFrame;
+
+class nsTreeBoxObject : public nsITreeBoxObject, public nsBoxObject
+{
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(nsTreeBoxObject, nsBoxObject)
+  NS_DECL_NSITREEBOXOBJECT
+
+  nsTreeBoxObject();
+  ~nsTreeBoxObject();
+
+  nsTreeBodyFrame* GetTreeBody(bool aFlushLayout = false);
+  nsTreeBodyFrame* GetCachedTreeBody() { return mTreeBody; }
+
+  //NS_PIBOXOBJECT interfaces
+  virtual void Clear() MOZ_OVERRIDE;
+  virtual void ClearCachedValues() MOZ_OVERRIDE;
+
+protected:
+  nsTreeBodyFrame* mTreeBody;
+  nsCOMPtr<nsITreeView> mView;
+};
+
+#endif