Adjust visual overflow rect for rounded/shifted ascent/descent

third_party/WebKit/LayoutTests/platform/mac/paint/invalidation/invalidate-caret-before-text-node-update-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow DIV id='root' class='editing'",
           "rect": [3, 3, 794, 28],
           "reason": "full"
         },
         {
           "object": "LayoutText #text",
-          "rect": [8, 8, 10, 18],
+          "rect": [8, 7, 10, 19],
           "reason": "layoutObject removal"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutText #text",
       "reason": "layoutObject removal"
     },
     {
       "object": "LayoutBlockFlow DIV id='root' class='editing'",
       "reason": "full"
     },
     {
       "object": "Caret",
       "reason": "caret"
     }
   ]
 }