Adjust visual overflow rect for rounded/shifted ascent/descent

third_party/WebKit/LayoutTests/paint/invalidation/selection/invalidation-rect-includes-newline-for-vertical-lr-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutText #text",
-          "rect": [8, 8, 32, 48],
+          "rect": [7, 8, 34, 48],
           "reason": "bounds change"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow HTML",
       "reason": "selection"
     },
@@ skipping 13 matching lines @@
       "object": "InlineTextBox 'xx'",
       "reason": "bounds change"
     },
     {
       "object": "InlineTextBox 'y'",
       "reason": "bounds change"
     }
   ]
 }