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

third_party/WebKit/LayoutTests/paint/invalidation/fixed-table-overflow-zindex-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 2016],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutTable (positioned) TABLE",
           "rect": [0, 0, 200, 200],
           "reason": "style change"
         },
         {
-          "object": "LayoutTableSection TBODY",
-          "rect": [0, 0, 200, 200],
-          "reason": "forced by layout"
-        },
-        {
           "object": "LayoutBlockFlow (positioned) TD id='moveMe' class='fixed'",
           "rect": [100, 100, 100, 100],
           "reason": "layoutObject insertion"
         },
         {
           "object": "LayoutTableCell (anonymous)",
           "rect": [0, 100, 100, 100],
           "reason": "layoutObject insertion"
         },
         {
@@ skipping 21 matching lines @@
       "object": "LayoutTableCell (anonymous)",
       "reason": "layoutObject insertion"
     },
     {
       "object": "LayoutBlockFlow (positioned) TD id='moveMe' class='fixed'",
       "reason": "layoutObject insertion"
     }
   ]
 }