Don't invalidate rect if it's covered by fully invalidated parent's visual rect

third_party/WebKit/LayoutTests/platform/win/paint/invalidation/caret-with-composited-scroll-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true
     },
     {
       "name": "LayoutBlockFlow DIV id='scroller'",
       "position": [8, 44],
       "bounds": [100, 100],
       "shouldFlattenTransform": false,
       "drawsContent": true
     },
     {
       "name": "Scrolling Layer",
       "bounds": [100, 100],
       "shouldFlattenTransform": false
     },
     {
       "name": "Scrolling Contents Layer",
       "bounds": [205, 1022],
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutTextControl INPUT id='text'",
           "rect": [-1, 999, 207, 24],
           "reason": "subtree"
-        },
-        {
-          "object": "LayoutBlockFlow DIV id='inner-editor'",
-          "rect": [3, 1003, 200, 16],
-          "reason": "subtree"
         }
       ]
     },
     {
       "name": "Overflow Controls Host Layer",
       "bounds": [100, 100]
     },
     {
       "name": "Horizontal Scrollbar Layer",
       "position": [0, 100],
@@ skipping 16 matching lines @@
       "object": "LayoutBlockFlow DIV id='inner-editor'",
       "reason": "subtree"
     },
     {
       "object": "Caret",
       "reason": "caret"
     }
   ]
 }