diff -r 000000000000 -r 6474c204b198 layout/xul/nsButtonBoxFrame.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/nsButtonBoxFrame.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+/* -*- 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 nsButtonBoxFrame_h___
+#define nsButtonBoxFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsBoxFrame.h"
+
+class nsButtonBoxFrame : public nsBoxFrame
+{
+public:
+  NS_DECL_FRAMEARENA_HELPERS
+
+  friend nsIFrame* NS_NewButtonBoxFrame(nsIPresShell* aPresShell);
+
+  nsButtonBoxFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
+    :nsBoxFrame(aPresShell, aContext, false) {
+    UpdateMouseThrough();
+  }
+
+  virtual void BuildDisplayListForChildren(nsDisplayListBuilder*   aBuilder,
+                                           const nsRect&           aDirtyRect,
+                                           const nsDisplayListSet& aLists) MOZ_OVERRIDE;
+
+  virtual nsresult HandleEvent(nsPresContext* aPresContext, 
+                               mozilla::WidgetGUIEvent* aEvent,
+                               nsEventStatus* aEventStatus) MOZ_OVERRIDE;
+
+  virtual void MouseClicked(nsPresContext* aPresContext,
+                            mozilla::WidgetGUIEvent* aEvent)
+  { DoMouseClick(aEvent, false); }
+
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE {
+    return MakeFrameName(NS_LITERAL_STRING("ButtonBoxFrame"), aResult);
+  }
+#endif
+
+  /**
+   * Our implementation of MouseClicked. 
+   * @param aTrustEvent if true and aEvent as null, then assume the event was trusted
+   */
+  void DoMouseClick(mozilla::WidgetGUIEvent* aEvent, bool aTrustEvent);
+  void UpdateMouseThrough() MOZ_OVERRIDE { AddStateBits(NS_FRAME_MOUSE_THROUGH_NEVER); }
+}; // class nsButtonBoxFrame
+
+#endif /* nsButtonBoxFrame_h___ */