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diff --git a/layout/xul/SimpleXULLeafFrame.h b/layout/xul/SimpleXULLeafFrame.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+// A simple frame class for XUL frames that are leafs on the tree but need
+// background / border painting, and for some reason or another need special
+// code (like event handling code) which we haven't ported to the DOM.
+//
+// This should generally not be used for new frame classes.
+
+#ifndef mozilla_SimpleXULLeafFrame_h
+#define mozilla_SimpleXULLeafFrame_h
+
+#include "nsLeafFrame.h"
+
+namespace mozilla {
+
+// Shared class for thumb and scrollbar buttons.
+class SimpleXULLeafFrame : public nsLeafFrame {
+ public:
+ NS_DECL_FRAMEARENA_HELPERS(SimpleXULLeafFrame)
+
+ // TODO: Look at appearance instead maybe?
+ nscoord GetIntrinsicISize() override { return 0; }
+ nscoord GetIntrinsicBSize() override { return 0; }
+
+ void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
+ const ReflowInput& aReflowInput,
+ nsReflowStatus& aStatus) override;
+ explicit SimpleXULLeafFrame(ComputedStyle* aStyle,
+ nsPresContext* aPresContext, ClassID aClassID)
+ : nsLeafFrame(aStyle, aPresContext, aClassID) {}
+
+ explicit SimpleXULLeafFrame(ComputedStyle* aStyle,
+ nsPresContext* aPresContext)
+ : SimpleXULLeafFrame(aStyle, aPresContext, kClassID) {}
+
+ friend nsIFrame* NS_NewSimpleXULLeafFrame(mozilla::PresShell* aPresShell,
+ ComputedStyle* aStyle);
+};
+
+} // namespace mozilla
+
+#endif