diff -r 000000000000 -r 6474c204b198 layout/xul/tree/nsTreeUtils.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/tree/nsTreeUtils.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 3; 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 nsTreeUtils_h__
+#define nsTreeUtils_h__
+
+#include "nsError.h"
+#include "nsString.h"
+#include "nsTreeStyleCache.h"
+
+class nsIAtom;
+class nsIContent;
+
+class nsTreeUtils
+{
+  public:
+    /**
+     * Parse a whitespace separated list of properties into an array
+     * of atoms.
+     */
+    static nsresult
+    TokenizeProperties(const nsAString& aProperties, AtomArray & aPropertiesArray);
+
+    static nsIContent*
+    GetImmediateChild(nsIContent* aContainer, nsIAtom* aTag);
+
+    static nsIContent*
+    GetDescendantChild(nsIContent* aContainer, nsIAtom* aTag);
+
+    static nsresult
+    UpdateSortIndicators(nsIContent* aColumn, const nsAString& aDirection);
+
+    static nsresult
+    GetColumnIndex(nsIContent* aColumn, int32_t* aResult);
+};
+
+#endif // nsTreeUtils_h__