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

third_party/WebKit/LayoutTests/platform/mac/paint/invalidation/invalidate-caret-in-non-composited-scrolling-container-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true
     },
     {
       "name": "LayoutTextControl INPUT id='root'",
       "position": [5, 5],
       "bounds": [47, 25],
       "drawsContent": true,
       "backgroundColor": "#FFFFFF",
       "paintInvalidations": [
         {
           "object": "LayoutTextControl INPUT id='root'",
           "rect": [0, 0, 47, 25],
           "reason": "subtree"
         },
         {
           "object": "LayoutTextControl INPUT id='root'",
           "rect": [0, 0, 41, 19],
           "reason": "full"
-        },
-        {
-          "object": "LayoutBlockFlow DIV id='inner-editor'",
-          "rect": [6, 6, 35, 13],
-          "reason": "subtree"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [6, 6, 35, 13],
-          "reason": "subtree"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutTextControl INPUT id='root'",
       "reason": "subtree"
     },
     {
@@ skipping 16 matching lines @@
       "object": "LayoutText #text",
       "reason": "subtree"
     },
     {
       "object": "InlineTextBox 'test test test'",
       "reason": "subtree"
     }
   ]
 }