Auto-rebaseline for r181413

LayoutTests/platform/mac/virtual/gpu/compositedscrolling/overflow/selection-gaps-after-removing-scrolling-contents-expected.txt

 This test passes if the container's scrolling contents layer (the first child of the GraphicsLayer with 4 children) draws content only on iterations 1 and 2, and its scrolling block selection layer (the child of the scrolling contents layer) draws content only on iteration 3. The scrolling block selection layer should also be much smaller than the scrolling contents layer.
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@@ skipping 260 matching lines @@
   "bounds": [785, 4416],
   "children": [
     {
       "bounds": [785, 4416],
       "contentsOpaque": true,
       "drawsContent": true,
       "children": [
         {
           "position": [8, 80],
           "bounds": [300, 500],
+          "drawsContent": true,
           "children": [
             {
               "bounds": [285, 485],
               "children": [
                 {
                   "bounds": [285, 665],
                   "shouldFlattenTransform": false,
                   "children": [
                     {
                       "position": [0, 195],
@@ skipping 96 matching lines @@
         }
       ]
     }
   ]
 }
 
 
 *** iteration 4: ***
 
 {
-  "bounds": [785, 6306],
+  "bounds": [785, 6321],
   "children": [
     {
-      "bounds": [785, 6306],
+      "bounds": [785, 6321],
       "contentsOpaque": true,
       "drawsContent": true,
       "children": [
         {
           "position": [8, 80],
           "bounds": [300, 500],
+          "drawsContent": true,
           "children": [
             {
               "bounds": [285, 485],
               "children": [
                 {
                   "bounds": [285, 665],
                   "shouldFlattenTransform": false,
                   "children": [
                     {
                       "position": [0, 195],
@@ skipping 91 matching lines @@
           "bounds": [100, 50],
           "contentsOpaque": true,
           "drawsContent": true,
           "backgroundColor": "#FFA500"
         }
       ]
     }
   ]
 }