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

third_party/WebKit/LayoutTests/paint/invalidation/insert-frame-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow BODY",
           "rect": [0, 0, 800, 200],
           "reason": "forced by layout"
         },
         {
-          "object": "LayoutIFrame IFRAME",
-          "rect": [0, 0, 104, 104],
-          "reason": "layoutObject insertion"
-        },
-        {
-          "object": "LayoutBlockFlow HTML",
-          "rect": [2, 2, 100, 100],
-          "reason": "layoutObject insertion"
-        },
-        {
           "object": "LayoutView #document",
           "rect": [2, 2, 100, 100],
           "reason": "style change"
-        },
-        {
-          "object": "LayoutBlockFlow BODY",
-          "rect": [10, 10, 84, 84],
-          "reason": "layoutObject insertion"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow BODY",
       "reason": "forced by layout"
     },
     {
       "object": "RootInlineBox",
       "reason": "forced by layout"
     },
     {
       "object": "LayoutIFrame IFRAME",
       "reason": "layoutObject insertion"
     }
   ]
 }