Auto-rebaseline for r181492

LayoutTests/platform/win/css3/compositing/mix-blend-mode-composited-layers-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "children": [
         {
           "bounds": [800, 70],
           "isolate": true,
@@ skipping 15 matching lines @@
                 }
               ]
             }
           ]
         }
       ]
     }
   ]
 }