Auto-rebaseline for r191480

LayoutTests/compositing/layer-creation/scroll-blocks-on-explicit-expected.txt

 Verifies that setting the scroll-blocks-on property in a stylesheet creates layers with the correct modes only when it's greater than the defaults on the root.  In this case, only 'addScroll' should get a layer.
 
 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
-      "scrollBlocksOn": ["StartTouch", "WheelEvent"],
+      "scrollBlocksOn": [
+        "StartTouch",
+        "WheelEvent"
+      ],
       "contentsOpaque": true,
       "drawsContent": true,
       "children": [
         {
           "position": [8, 8],
           "bounds": [784, 1],
-          "scrollBlocksOn": ["WheelEvent"]
+          "scrollBlocksOn": [
+            "WheelEvent"
+          ]
         },
         {
           "position": [8, 9],
           "bounds": [784, 2],
-          "scrollBlocksOn": ["StartTouch", "ScrollEvent"]
+          "scrollBlocksOn": [
+            "StartTouch",
+            "ScrollEvent"
+          ]
         }
       ]
     }
   ]
 }