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

third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/inline-focus-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow P",
           "rect": [0, 36, 800, 20],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow (anonymous)",
           "rect": [0, 0, 800, 20],
           "reason": "forced by layout"
         },
         {
-          "object": "LayoutText #text",
-          "rect": [0, 36, 395, 19],
-          "reason": "forced by layout"
-        },
-        {
           "object": "LayoutInline A id='link'",
           "rect": [585, -1, 216, 234],
           "reason": "style change"
         },
         {
           "object": "LayoutText #text",
           "rect": [0, 0, 37, 19],
           "reason": "forced by layout"
         }
       ]
@@ skipping 32 matching lines @@
       "object": "LayoutText #text",
       "reason": "forced by layout"
     },
     {
       "object": "InlineTextBox 'crbug.com/424078: ensure inline elements get their outline painted'",
       "reason": "forced by layout"
     }
   ]
 }