diff -r 000000000000 -r 6474c204b198 content/base/src/nsTraversal.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/base/src/nsTraversal.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * 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/. */
+ 
+/*
+ * Implementation of DOM Traversal's nsIDOMTreeWalker
+ */
+
+#ifndef nsTraversal_h___
+#define nsTraversal_h___
+
+#include "nsCOMPtr.h"
+#include "nsIDocument.h"
+#include "mozilla/dom/CallbackObject.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/dom/NodeFilterBinding.h"
+#include "nsIDOMNodeFilter.h"
+
+class nsINode;
+
+class nsTraversal
+{
+public:
+    nsTraversal(nsINode *aRoot,
+                uint32_t aWhatToShow,
+                const mozilla::dom::NodeFilterHolder &aFilter);
+    virtual ~nsTraversal();
+
+protected:
+    nsCOMPtr<nsINode> mRoot;
+    uint32_t mWhatToShow;
+    mozilla::dom::NodeFilterHolder mFilter;
+    bool mInAcceptNode;
+
+    /*
+     * Tests if and how a node should be filtered. Uses mWhatToShow and
+     * mFilter to test the node.
+     * @param aNode     Node to test
+     * @param aResult   Whether we succeeded
+     * @returns         Filtervalue. See nsIDOMNodeFilter.idl
+     */
+    int16_t TestNode(nsINode* aNode, mozilla::ErrorResult& aResult);
+};
+
+#endif
+