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

third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/scroll-stacking-context-backface-visiblity-leaves-traces-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [785, 5056],
       "contentsOpaque": true,
       "drawsContent": true
     },
     {
       "name": "LayoutBlockFlow (relative positioned) HEADER",
       "position": [8, 28],
       "bounds": [769, 1972],
       "drawsContent": true,
       "backfaceVisibility": "hidden",
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow (positioned) DIV id='searchbar'",
           "rect": [10, 1822, 150, 150],
           "reason": "subtree"
         },
         {
-          "object": "LayoutBlockFlow DIV id='recentlink'",
-          "rect": [10, 1822, 150, 150],
-          "reason": "subtree"
-        },
-        {
           "object": "LayoutBlockFlow (positioned) DIV id='searchbar'",
           "rect": [10, 1422, 150, 150],
           "reason": "subtree"
-        },
-        {
-          "object": "LayoutBlockFlow DIV id='recentlink'",
-          "rect": [10, 1422, 150, 150],
-          "reason": "subtree"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow (positioned) DIV id='searchbar'",
       "reason": "subtree"
     },
     {
       "object": "LayoutBlockFlow DIV id='recentlink'",
       "reason": "subtree"
     }
   ]
 }