Paint collapsed borders of a table as one display item

third_party/WebKit/LayoutTests/paint/invalidation/table/collapsed-border-cell-resize-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
+          "object": "LayoutTable TABLE",
+          "rect": [8, 8, 104, 204],
+          "reason": "forced by layout"
+        },
+        {
           "object": "LayoutTableCell TD id='target'",
           "rect": [8, 8, 104, 204],
           "reason": "border box change"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
+      "object": "LayoutTable TABLE",
+      "reason": "forced by layout"
+    },
+    {
       "object": "LayoutTableCell TD id='target'",
       "reason": "border box change"
     }
   ]
 }