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

third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/outline-continuations-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow (anonymous)",
           "rect": [18, 150, 200, 20],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow (anonymous)",
           "rect": [18, 110, 200, 20],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutInline SPAN id='outer'",
           "rect": [16, 108, 87, 63],
           "reason": "style change"
         },
         {
           "object": "LayoutInline SPAN id='outer'",
           "rect": [16, 148, 87, 23],
           "reason": "style change"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [18, 150, 83, 19],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [18, 110, 83, 19],
-          "reason": "forced by layout"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow (anonymous)",
       "reason": "forced by layout"
     },
     {
@@ skipping 44 matching lines @@
       "object": "LayoutBlockFlow (anonymous)",
       "reason": "forced by layout"
     },
     {
       "object": "LayoutInline SPAN id='outer'",
       "reason": "style change"
     }
   ]
 }