Introduce Layout*::adjustVisualRectForRasterEffects and use it for SVG hairlines.

third_party/WebKit/LayoutTests/paint/invalidation/svg/js-update-polygon-changes-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutSVGPath polygon id='polygon'",
-          "rect": [265, 219, 162, 105],
+          "rect": [264, 218, 164, 107],
           "reason": "full"
         },
         {
+          "object": "LayoutSVGPath polygon id='polygon'",
+          "rect": [264, 208, 164, 107],
+          "reason": "full"
+        },
+        {
           "object": "LayoutSVGRoot svg",
           "rect": [265, 219, 162, 105],
           "reason": "bounds change"
         },
         {
-          "object": "LayoutSVGPath polygon id='polygon'",
-          "rect": [265, 209, 162, 105],
-          "reason": "full"
-        },
-        {
           "object": "LayoutSVGRoot svg",
           "rect": [265, 209, 162, 105],
           "reason": "bounds change"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutSVGRoot svg",
       "reason": "bounds change"
     },
     {
       "object": "LayoutSVGPath polygon id='polygon'",
       "reason": "full"
     }
   ]
 }