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

third_party/WebKit/LayoutTests/paint/invalidation/svg/js-update-container-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutSVGContainer g id='group'",
           "rect": [0, 0, 76, 76],
           "reason": "subtree"
         },
         {
           "object": "LayoutSVGRect rect",
-          "rect": [0, 0, 76, 76],
-          "reason": "subtree"
-        },
-        {
-          "object": "LayoutSVGRect rect",
           "rect": [-1, -1, 41, 41],
           "reason": "subtree"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutSVGContainer g id='group'",
       "reason": "subtree"
     },
     {
       "object": "LayoutSVGRect rect",
       "reason": "subtree"
     }
   ]
 }