diff -r 000000000000 -r 6474c204b198 layout/xul/grid/nsGridRowGroupLayout.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/grid/nsGridRowGroupLayout.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+/* -*- 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/. */
+
+/**
+ 
+  Author:
+  Eric D Vaughan
+
+**/
+
+#ifndef nsGridRowGroupLayout_h___
+#define nsGridRowGroupLayout_h___
+
+#include "mozilla/Attributes.h"
+#include "nsGridRowLayout.h"
+
+/**
+ * The nsBoxLayout implementation for nsGridRowGroupFrame.
+ */
+class nsGridRowGroupLayout : public nsGridRowLayout
+{
+public:
+
+  friend already_AddRefed<nsBoxLayout> NS_NewGridRowGroupLayout();
+
+  virtual nsGridRowGroupLayout* CastToRowGroupLayout() MOZ_OVERRIDE { return this; }
+  virtual nsSize GetMinSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
+  virtual nsSize GetPrefSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
+  virtual nsSize GetMaxSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
+  virtual void CountRowsColumns(nsIFrame* aBox, int32_t& aRowCount, int32_t& aComputedColumnCount) MOZ_OVERRIDE;
+  virtual void DirtyRows(nsIFrame* aBox, nsBoxLayoutState& aState) MOZ_OVERRIDE;
+  virtual int32_t BuildRows(nsIFrame* aBox, nsGridRow* aRows) MOZ_OVERRIDE;
+  virtual nsMargin GetTotalMargin(nsIFrame* aBox, bool aIsHorizontal) MOZ_OVERRIDE;
+  virtual int32_t GetRowCount() MOZ_OVERRIDE { return mRowCount; }
+  virtual Type GetType() MOZ_OVERRIDE { return eRowGroup; }
+
+protected:
+  nsGridRowGroupLayout();
+  virtual ~nsGridRowGroupLayout();
+
+  virtual void ChildAddedOrRemoved(nsIFrame* aBox, nsBoxLayoutState& aState) MOZ_OVERRIDE;
+  static void AddWidth(nsSize& aSize, nscoord aSize2, bool aIsHorizontal);
+
+private:
+  int32_t mRowCount;
+};
+
+#endif
+