Fix gradient background invalidation when HTML size changes

third_party/WebKit/LayoutTests/paint/invalidation/window-resize-centered-inline-under-fixed-pos-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [600, 250],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow (positioned) DIV class='container'",
           "rect": [0, 0, 600, 500],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutView #document",
           "rect": [0, 250, 600, 250],
           "reason": "incremental"
         },
         {
-          "object": "LayoutBlockFlow HTML",
-          "rect": [0, 0, 600, 8],
-          "reason": "forced by layout"
-        },
-        {
           "object": "LayoutBlockFlow DIV class='parent'",
           "rect": [0, 0, 6, 500],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow (relative positioned) DIV class='child'",
           "rect": [0, 250, 6, 30],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow (relative positioned) DIV class='child'",
           "rect": [0, 125, 6, 30],
           "reason": "forced by layout"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutView #document",
       "reason": "incremental"
     },
     {
-      "object": "LayoutBlockFlow HTML",
-      "reason": "forced by layout"
-    },
-    {
       "object": "LayoutBlockFlow (positioned) DIV class='container'",
       "reason": "forced by layout"
     },
     {
       "object": "LayoutBlockFlow DIV class='parent'",
       "reason": "forced by layout"
     },
     {
       "object": "RootInlineBox",
       "reason": "forced by layout"
@@ skipping 11 matching lines @@
       "bounds": [400, 250],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow (positioned) DIV class='container'",
           "rect": [0, 0, 600, 250],
           "reason": "forced by layout"
         },
         {
-          "object": "LayoutBlockFlow HTML",
-          "rect": [0, 0, 600, 8],
-          "reason": "forced by layout"
-        },
-        {
           "object": "LayoutView #document",
           "rect": [400, 0, 200, 250],
           "reason": "incremental"
         },
         {
           "object": "LayoutBlockFlow DIV class='parent'",
           "rect": [0, 0, 6, 250],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow (relative positioned) DIV class='child'",
           "rect": [0, 125, 6, 30],
           "reason": "forced by layout"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutView #document",
       "reason": "incremental"
     },
     {
-      "object": "LayoutBlockFlow HTML",
-      "reason": "forced by layout"
-    },
-    {
       "object": "LayoutBlockFlow (positioned) DIV class='container'",
       "reason": "forced by layout"
     },
     {
       "object": "LayoutBlockFlow DIV class='parent'",
       "reason": "forced by layout"
     },
     {
       "object": "RootInlineBox",
       "reason": "forced by layout"
@@ skipping 16 matching lines @@
           "object": "LayoutBlockFlow (positioned) DIV class='container'",
           "rect": [0, 0, 400, 600],
           "reason": "full"
         },
         {
           "object": "LayoutView #document",
           "rect": [0, 250, 400, 350],
           "reason": "incremental"
         },
         {
-          "object": "LayoutBlockFlow HTML",
-          "rect": [0, 0, 400, 8],
-          "reason": "forced by layout"
-        },
-        {
           "object": "LayoutBlockFlow DIV class='parent'",
           "rect": [0, 0, 6, 600],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow (relative positioned) DIV class='child'",
           "rect": [0, 300, 6, 30],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow (relative positioned) DIV class='child'",
           "rect": [0, 125, 6, 30],
           "reason": "forced by layout"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutView #document",
       "reason": "incremental"
     },
     {
-      "object": "LayoutBlockFlow HTML",
-      "reason": "forced by layout"
-    },
-    {
       "object": "LayoutBlockFlow (positioned) DIV class='container'",
       "reason": "full"
     },
     {
       "object": "LayoutBlockFlow DIV class='parent'",
       "reason": "forced by layout"
     },
     {
       "object": "RootInlineBox",
       "reason": "forced by layout"
@@ skipping 11 matching lines @@
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow (positioned) DIV class='container'",
           "rect": [0, 0, 800, 600],
           "reason": "full"
         },
         {
-          "object": "LayoutBlockFlow HTML",
-          "rect": [0, 0, 800, 8],
-          "reason": "forced by layout"
-        },
-        {
           "object": "LayoutView #document",
           "rect": [400, 0, 400, 600],
           "reason": "incremental"
         },
         {
           "object": "LayoutBlockFlow DIV class='parent'",
           "rect": [0, 0, 6, 600],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow (relative positioned) DIV class='child'",
           "rect": [0, 300, 6, 30],
           "reason": "forced by layout"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutView #document",
       "reason": "incremental"
     },
     {
-      "object": "LayoutBlockFlow HTML",
-      "reason": "forced by layout"
-    },
-    {
       "object": "LayoutBlockFlow (positioned) DIV class='container'",
       "reason": "full"
     },
     {
       "object": "LayoutBlockFlow DIV class='parent'",
       "reason": "forced by layout"
     },
     {
       "object": "RootInlineBox",
       "reason": "forced by layout"
     },
     {
       "object": "LayoutBlockFlow (relative positioned) DIV class='child'",
       "reason": "forced by layout"
     }
   ]
 }