Collapse whitespace away when creating whitespace layout objects.

third_party/WebKit/LayoutTests/paint/invalidation/absolute-display-block-to-none-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
+          "object": "LayoutBlockFlow BODY",
+          "rect": [8, 8, 784, 20],
+          "reason": "forced by layout"
+        },
+        {
           "object": "LayoutBlockFlow (positioned) DIV id='absolute'",
           "rect": [100, 100, 100, 100],
           "reason": "layoutObject removal"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow (positioned) DIV id='absolute'",
       "reason": "layoutObject removal"
+    },
+    {
+      "object": "LayoutText #text",
+      "reason": "layoutObject removal"
+    },
+    {
+      "object": "LayoutBlockFlow BODY",
+      "reason": "forced by layout"
+    },
+    {
+      "object": "RootInlineBox",
+      "reason": "forced by layout"
+    },
+    {
+      "object": "LayoutText #text",
+      "reason": "forced by layout"
+    },
+    {
+      "object": "InlineTextBox 'When an absolute positioned element is set display:none, we should not invalidate the whole body.'",
+      "reason": "forced by layout"
     }
   ]
 }