diff -r 000000000000 -r 6474c204b198 layout/xul/grid/nsGridRow.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/grid/nsGridRow.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,57 @@
+/* -*- 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/. */
+
+//
+// Eric Vaughan
+// Netscape Communications
+//
+// See documentation in associated header file
+//
+
+#include "nsGridRow.h"
+#include "nsBoxLayoutState.h"
+#include "nsIFrame.h"
+
+nsGridRow::nsGridRow():mIsBogus(false),
+                       mBox(nullptr), 
+                       mFlex(-1),
+                       mPref(-1),
+                       mMin(-1),
+                       mMax(-1),
+                       mTop(-1),
+                       mBottom(-1), 
+                       mTopMargin(0),
+                       mBottomMargin(0)
+
+{
+    MOZ_COUNT_CTOR(nsGridRow);
+}
+
+void
+nsGridRow::Init(nsIFrame* aBox, bool aIsBogus)
+{
+  mBox = aBox;
+  mIsBogus = aIsBogus;
+  mFlex = -1;
+  mPref = -1;
+  mMin = -1;
+  mMax = -1;
+  mTop = -1;
+  mBottom = -1;
+  mTopMargin = 0;
+  mBottomMargin = 0;
+}
+
+nsGridRow::~nsGridRow()
+{
+   MOZ_COUNT_DTOR(nsGridRow);
+}
+
+bool 
+nsGridRow::IsCollapsed()
+{
+  return mBox && mBox->IsCollapsed();
+}
+