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

third_party/WebKit/LayoutTests/platform/win/paint/invalidation/line-flow-with-floats-6-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutText #text",
           "rect": [14, 242, 406, 125],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutText #text",
           "rect": [65, 368, 304, 17],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutText #text",
           "rect": [178, 350, 146, 17],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow (floating) SPAN id='blueFloat'",
           "rect": [14, 353, 48, 65],
           "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [27, 353, 22, 18],
-          "reason": "layoutObject insertion"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutText #text",
       "reason": "forced by layout"
     },
     {
@@ skipping 72 matching lines @@
       "object": "LayoutText #text",
       "reason": "forced by layout"
     },
     {
       "object": "InlineTextBox 'The players all played at once without waiting'",
       "reason": "forced by layout"
     }
   ]
 }