diff -r 000000000000 -r 6474c204b198 content/xul/templates/src/nsContentTestNode.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/xul/templates/src/nsContentTestNode.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/. */
+
+#ifndef nsContentTestNode_h__
+#define nsContentTestNode_h__
+
+#include "mozilla/Attributes.h"
+#include "nscore.h"
+#include "nsRuleNetwork.h"
+#include "nsIAtom.h"
+#include "nsIDOMDocument.h"
+
+class nsIXULTemplateBuilder;
+
+/**
+ * The nsContentTestNode is always the top node in a query's rule network. It
+ * exists so that Constrain can filter out resources that aren't part of a
+ * result.
+ */
+class nsContentTestNode : public TestNode
+{
+public:
+    nsContentTestNode(nsXULTemplateQueryProcessorRDF* aProcessor,
+                      nsIAtom* aContentVariable);
+
+    virtual nsresult FilterInstantiations(InstantiationSet& aInstantiations,
+                                          bool* aCantHandleYet) const MOZ_OVERRIDE;
+
+    nsresult
+    Constrain(InstantiationSet& aInstantiations) MOZ_OVERRIDE;
+
+    void SetTag(nsIAtom* aTag, nsIDOMDocument* aDocument)
+    {
+        mTag = aTag;
+        mDocument = aDocument;
+    }
+
+protected:
+    nsXULTemplateQueryProcessorRDF *mProcessor;
+    nsIDOMDocument* mDocument;
+    nsCOMPtr<nsIAtom> mRefVariable;
+    nsCOMPtr<nsIAtom> mTag;
+};
+
+#endif // nsContentTestNode_h__
+