Tweak PaintInvalidationReasons

third_party/WebKit/LayoutTests/platform/mac/paint/invalidation/resize-scrollable-iframe-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow (anonymous)",
           "rect": [8, 108, 784, 304],
-          "reason": "forced by layout"
+          "reason": "geometry"
         },
         {
           "object": "LayoutView #document",
           "rect": [8, 193, 285, 200],
           "reason": "incremental"
         },
         {
           "object": "LayoutView #document",
           "rect": [8, 393, 285, 15],
-          "reason": "scroll"
+          "reason": "scroll control"
         },
         {
           "object": "LayoutView #document",
           "rect": [93, 108, 200, 285],
           "reason": "incremental"
         },
         {
           "object": "LayoutView #document",
           "rect": [8, 193, 85, 15],
-          "reason": "scroll"
+          "reason": "scroll control"
         },
         {
           "object": "LayoutView #document",
           "rect": [293, 108, 15, 285],
-          "reason": "scroll"
+          "reason": "scroll control"
         },
         {
           "object": "LayoutView #document",
           "rect": [93, 108, 15, 85],
-          "reason": "scroll"
+          "reason": "scroll control"
         },
         {
           "object": "LayoutView #document",
           "rect": [293, 393, 15, 15],
-          "reason": "scroll"
+          "reason": "scroll control"
         },
         {
           "object": "LayoutView #document",
           "rect": [93, 193, 15, 15],
-          "reason": "scroll"
+          "reason": "scroll control"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow (anonymous)",
-      "reason": "forced by layout"
+      "reason": "geometry"
     },
     {
       "object": "RootInlineBox",
-      "reason": "forced by layout"
+      "reason": "geometry"
     },
     {
       "object": "LayoutIFrame IFRAME id='iframe'",
-      "reason": "forced by layout"
+      "reason": "geometry"
     },
     {
       "object": "LayoutView #document",
-      "reason": "scroll"
+      "reason": "geometry"
     },
     {
       "object": "HorizontalScrollbar",
-      "reason": "scroll"
+      "reason": "scroll control"
     },
     {
       "object": "LayoutView #document",
-      "reason": "scroll"
+      "reason": "geometry"
     },
     {
       "object": "VerticalScrollbar",
-      "reason": "scroll"
+      "reason": "scroll control"
     },
     {
       "object": "LayoutView #document",
       "reason": "incremental"
     }
   ]
 }