Tweak PaintInvalidationReasons

third_party/WebKit/LayoutTests/platform/mac/virtual/disable-spinvalidation/paint/invalidation/compositing/iframe-inside-squashed-layer-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [785, 1016],
       "contentsOpaque": true,
       "drawsContent": true
     },
     {
       "name": "Squashing Containment Layer",
@@ skipping 14 matching lines @@
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutView #document",
           "rect": [0, 500, 300, 150],
           "reason": "style change"
         },
         {
           "object": "LayoutBlockFlow BODY",
           "rect": [8, 508, 284, 18],
-          "reason": "forced by layout"
+          "reason": "geometry"
         },
         {
           "object": "LayoutBlockFlow BODY",
           "rect": [8, 508, 269, 142],
-          "reason": "forced by layout"
+          "reason": "geometry"
         },
         {
           "object": "LayoutText #text",
           "rect": [8, 508, 31, 18],
-          "reason": "forced by layout"
+          "reason": "geometry"
         },
         {
           "object": "LayoutView #document",
           "rect": [285, 500, 15, 150],
-          "reason": "scroll"
+          "reason": "scroll control"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutView #document",
-      "reason": "scroll"
+      "reason": "geometry"
     },
     {
       "object": "VerticalScrollbar",
-      "reason": "scroll"
+      "reason": "scroll control"
     },
     {
       "object": "LayoutView #document",
       "reason": "style change"
     },
     {
       "object": "LayoutBlockFlow BODY",
-      "reason": "forced by layout"
+      "reason": "geometry"
     },
     {
       "object": "RootInlineBox",
-      "reason": "forced by layout"
+      "reason": "geometry"
     },
     {
       "object": "LayoutText #text",
-      "reason": "forced by layout"
+      "reason": "geometry"
     },
     {
       "object": "InlineTextBox 'test1'",
-      "reason": "forced by layout"
+      "reason": "geometry"
     }
   ]
 }