Bug 701656 - Make WrapPreserve3DList capable of walking through child display items for the same frame. r=roc

layout/generic/nsFrame.cpp

@@ -1598,7 +1598,7 @@ WrapPreserve3DListInternal(nsIFrame* aFrame, nsDisplayListBuilder *aBuilder, nsD
     // and then flush this list into newList by wrapping the whole lot with a single
     // nsDisplayTransform.
 
-    if (childFrame && childFrame->GetParent()->Preserves3DChildren()) {
+    if (childFrame && (childFrame->GetParent()->Preserves3DChildren() || childFrame == aFrame)) {
       switch (item->GetType()) {
         case nsDisplayItem::TYPE_TRANSFORM: {
           if (!temp.IsEmpty()) {