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

third_party/WebKit/LayoutTests/platform/mac/paint/invalidation/multicol-repaint-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutMultiColumnFlowThread (anonymous)",
           "rect": [9, 9, 400, 100],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutInline SPAN id='a'",
           "rect": [234, 9, 300, 59],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutText #text",
-          "rect": [234, 15, 300, 50],
-          "reason": "layoutObject insertion"
-        },
-        {
-          "object": "LayoutText #text",
           "rect": [234, 15, 50, 50],
           "reason": "layoutObject removal"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [9, 9, 13, 59],
-          "reason": "forced by layout"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutText #text",
       "reason": "layoutObject removal"
     },
     {
@@ skipping 32 matching lines @@
       "object": "LayoutText #text",
       "reason": "layoutObject insertion"
     },
     {
       "object": "InlineTextBox 'XXXXXX'",
       "reason": "layoutObject insertion"
     }
   ]
 }