[CSS Grid Layout] Prevent issues with checkLayout() in grid items

LayoutTests/fast/css-grid-layout/grid-auto-columns-rows-update.html

Index: LayoutTests/fast/css-grid-layout/grid-auto-columns-rows-update.html
diff --git a/LayoutTests/fast/css-grid-layout/grid-auto-columns-rows-update.html b/LayoutTests/fast/css-grid-layout/grid-auto-columns-rows-update.html
index 1f7f33ed7f4ac9b92cc98456c695369eb9141f92..09a907ef60b070349f059989e2a14e8455b599f4 100644
--- a/LayoutTests/fast/css-grid-layout/grid-auto-columns-rows-update.html
+++ b/LayoutTests/fast/css-grid-layout/grid-auto-columns-rows-update.html
@@ -24,12 +24,12 @@ function updateAndCheck(gridElementID, defaultSizing, gridItemSize)
     gridItem.setAttribute("data-expected-width", gridItemSize.width);
     gridItem.setAttribute("data-expected-height", gridItemSize.height);
 
-    checkLayout("#" + gridElementID);
+    checkLayout("#" + gridElementID, document.getElementById("test-output"));
 }
 
 function updateGridAutoRowsColumns()
 {
-    checkLayout('.grid');
+    checkLayout('.grid', document.getElementById("test-output"));
 
     // The constrained example is always sized to the min width so we don't test max width.
     updateAndCheck("constrainedGrid", { 'rows': 'minmax(20em, 15px)', 'columns': '50px' }, { 'width': '50px', 'height': '200px' });
@@ -84,5 +84,7 @@ window.addEventListener("load", updateGridAutoRowsColumns, false);
     </div>
 </div>
 
+<div id="test-output"></div>
+
 </body>
 </html>