Don't invalidate rect if it's covered by fully invalidated parent's visual rect

third_party/WebKit/LayoutTests/paint/invalidation/scroll-inside-table-cell-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutTableCell (relative positioned) TD id='cellToScroll' class='relative'",
           "rect": [312, 112, 454, 469],
           "reason": "subtree"
         },
         {
           "object": "LayoutBlockFlow (positioned) DIV class='absolute green'",
           "rect": [314, 114, 435, 450],
           "reason": "subtree"
         },
         {
-          "object": "LayoutBlockFlow (relative positioned) DIV class='relative red'",
-          "rect": [314, 114, 435, 450],
-          "reason": "subtree"
-        },
-        {
           "object": "LayoutTableCell (relative positioned) TD id='cellToScroll' class='relative'",
           "rect": [314, 564, 435, 15],
           "reason": "scroll"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutTableCell (relative positioned) TD id='cellToScroll' class='relative'",
       "reason": "subtree"
     },
     {
       "object": "HorizontalScrollbar",
       "reason": "scroll"
     },
     {
       "object": "LayoutBlockFlow (relative positioned) DIV class='relative red'",
       "reason": "subtree"
     },
     {
       "object": "LayoutBlockFlow (positioned) DIV class='absolute green'",
       "reason": "subtree"
     }
   ]
 }