Fix paint invalidation for composited vertical-rl having overflow

third_party/WebKit/LayoutTests/paint/invalidation/vertical-rl-overflow-expected.txt

 {
   "name": "Content Root Layer",
-  "bounds": [785, 824],
+  "bounds": [800, 600],
   "children": [
     {
       "name": "LayoutView #document",
-      "bounds": [785, 824],
+      "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow (positioned) DIV id='div'",
-          "rect": [209, 209, 100, 100],
+          "rect": [50, 100, 150, 100],
           "reason": "style change"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow (positioned) DIV id='div'",
       "reason": "style change"
     }
   ]
 }