diff -r 000000000000 -r 6474c204b198 layout/xul/nsBoxLayout.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/nsBoxLayout.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,63 @@
+/* -*- 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 nsBoxLayout_h___
+#define nsBoxLayout_h___
+
+#include "nsISupports.h"
+#include "nsCoord.h"
+#include "nsFrameList.h"
+
+class nsIFrame;
+class nsBoxLayoutState;
+struct nsSize;
+struct nsMargin;
+
+#define NS_BOX_LAYOUT_IID \
+{ 0x09d522a7, 0x304c, 0x4137, \
+ { 0xaf, 0xc9, 0xe0, 0x80, 0x2e, 0x89, 0xb7, 0xe8 } }
+
+class nsIGridPart;
+
+class nsBoxLayout : public nsISupports {
+
+public:
+
+  nsBoxLayout() {}
+  virtual ~nsBoxLayout() {}
+
+  NS_DECL_ISUPPORTS
+
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_BOX_LAYOUT_IID)
+
+  NS_IMETHOD Layout(nsIFrame* aBox, nsBoxLayoutState& aState);
+
+  virtual nsSize GetPrefSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState);
+  virtual nsSize GetMinSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState);
+  virtual nsSize GetMaxSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState);
+  virtual nscoord GetAscent(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState);
+  virtual void ChildrenInserted(nsIFrame* aBox, nsBoxLayoutState& aState,
+                                nsIFrame* aPrevBox,
+                                const nsFrameList::Slice& aNewChildren) {}
+  virtual void ChildrenAppended(nsIFrame* aBox, nsBoxLayoutState& aState,
+                                const nsFrameList::Slice& aNewChildren) {}
+  virtual void ChildrenRemoved(nsIFrame* aBox, nsBoxLayoutState& aState, nsIFrame* aChildList) {}
+  virtual void ChildrenSet(nsIFrame* aBox, nsBoxLayoutState& aState, nsIFrame* aChildList) {}
+  virtual void IntrinsicWidthsDirty(nsIFrame* aBox, nsBoxLayoutState& aState) {}
+
+  virtual void AddBorderAndPadding(nsIFrame* aBox, nsSize& aSize);
+  virtual void AddMargin(nsIFrame* aChild, nsSize& aSize);
+  virtual void AddMargin(nsSize& aSize, const nsMargin& aMargin);
+
+  virtual nsIGridPart* AsGridPart() { return nullptr; }
+
+  static void AddLargestSize(nsSize& aSize, const nsSize& aToAdd);
+  static void AddSmallestSize(nsSize& aSize, const nsSize& aToAdd);
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsBoxLayout, NS_BOX_LAYOUT_IID)
+
+#endif
+