Move the anonymous decoration to decoratedName.

LayoutTests/platform/mac/virtual/slimmingpaint/fast/repaint/offset-change-wrong-invalidation-with-float-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [71, 92, 17, 18],
         [71, 92, 7, 18],
         [71, -158, 17, 18],
         [71, -158, 7, 18],
         [48, 92, 40, 18],
         [48, -158, 40, 18]
       ],
       "paintInvalidationClients": [
         "LayoutBlockFlow (positioned) UL id='submenu'",
         "LayoutListItem LI",
-        "LayoutListMarker"
+        "LayoutListMarker (anonymous)"
       ],
       "children": [
         {
           "position": [31, 42],
           "transformOrigin": [17, 9],
           "bounds": [24, 18],
           "drawsContent": true,
           "children": [
             {
               "position": [17, 0],
               "bounds": [0, 18],
               "backfaceVisibility": "hidden"
             }
           ]
         },
         {
           "position": [31, 42],
           "bounds": [17, 18],
           "drawsContent": true
         }
       ]
     }
   ]
 }