Tweak PaintInvalidationReasons

third_party/WebKit/LayoutTests/paint/invalidation/overflow-hidden-yet-scrolled-with-custom-scrollbar-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true
     },
     {
       "name": "LayoutBlockFlow DIV id='scroller'",
@@ skipping 18 matching lines @@
           "reason": "subtree"
         },
         {
           "object": "LayoutBlockFlow DIV id='target'",
           "rect": [1, 601, 100, 100],
           "reason": "subtree"
         },
         {
           "object": "LayoutBlockFlow DIV id='target'",
           "rect": [1, 689, 88, 12],
-          "reason": "scroll"
+          "reason": "scroll control"
         },
         {
           "object": "LayoutBlockFlow DIV id='target'",
           "rect": [1, 289, 88, 12],
-          "reason": "scroll"
+          "reason": "scroll control"
         },
         {
           "object": "LayoutBlockFlow DIV id='target'",
           "rect": [89, 601, 12, 88],
-          "reason": "scroll"
+          "reason": "scroll control"
         },
         {
           "object": "LayoutBlockFlow DIV id='target'",
           "rect": [89, 201, 12, 88],
-          "reason": "scroll"
+          "reason": "scroll control"
         },
         {
           "object": "LayoutBlockFlow DIV id='target'",
           "rect": [89, 689, 12, 12],
-          "reason": "scroll"
+          "reason": "scroll control"
         },
         {
           "object": "LayoutBlockFlow DIV id='target'",
           "rect": [89, 289, 12, 12],
-          "reason": "scroll"
+          "reason": "scroll control"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow DIV id='scroller'",
       "reason": "subtree"
     },
     {
       "object": "LayoutBlockFlow DIV",
       "reason": "subtree"
     },
     {
       "object": "LayoutBlockFlow DIV id='target'",
       "reason": "subtree"
     },
     {
       "object": "HorizontalScrollbar",
-      "reason": "scroll"
+      "reason": "scroll control"
     },
     {
       "object": "LayoutScrollbarPart (anonymous)",
-      "reason": "scroll"
+      "reason": "scroll control"
     },
     {
       "object": "VerticalScrollbar",
-      "reason": "scroll"
+      "reason": "scroll control"
     },
     {
       "object": "LayoutScrollbarPart (anonymous)",
-      "reason": "scroll"
+      "reason": "scroll control"
     }
   ]
 }