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

third_party/WebKit/LayoutTests/paint/invalidation/inline-reflow-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow (positioned) DIV id='div1' class='container'",
           "rect": [0, 0, 300, 200],
           "reason": "forced by layout"
         },
         {
-          "object": "LayoutText #text",
-          "rect": [0, 0, 300, 200],
-          "reason": "forced by layout"
-        },
-        {
           "object": "LayoutBlockFlow (positioned) DIV id='div2' class='container'",
           "rect": [0, 300, 300, 20],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow (positioned) DIV id='div1' class='container'",
           "rect": [0, 0, 200, 300],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutText #text",
           "rect": [0, 0, 200, 300],
           "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [0, 300, 180, 20],
-          "reason": "forced by layout"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow (positioned) DIV id='div1' class='container'",
       "reason": "forced by layout"
     },
     {
@@ skipping 56 matching lines @@
       "object": "LayoutText #text",
       "reason": "forced by layout"
     },
     {
       "object": "InlineTextBox 'A A A A A'",
       "reason": "forced by layout"
     }
   ]
 }