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

third_party/WebKit/LayoutTests/platform/mac/paint/invalidation/line-flow-with-floats-8-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow P",
           "rect": [8, 74, 418, 498],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutText #text",
-          "rect": [14, 242, 406, 126],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [14, 188, 406, 72],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [14, 404, 355, 72],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [14, 368, 355, 54],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
           "rect": [14, 404, 355, 36],
           "reason": "forced by layout"
         },
         {
-          "object": "LayoutText #text",
-          "rect": [14, 80, 354, 108],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [14, 368, 336, 18],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [65, 368, 304, 18],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [178, 350, 145, 18],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [127, 350, 145, 18],
-          "reason": "forced by layout"
-        },
-        {
           "object": "LayoutBlockFlow (floating) SPAN id='blueFloat'",
           "rect": [14, 353, 48, 65],
           "reason": "layoutObject removal"
         },
         {
           "object": "LayoutText #text",
           "rect": [14, 188, 40, 18],
           "reason": "forced by layout"
         }
       ]
@@ skipping 212 matching lines @@
       "object": "InlineTextBox 'her head!\u2019'",
       "reason": "forced by layout"
     },
     {
       "object": "InlineTextBox 'about once in a minute.\n'",
       "reason": "forced by layout"
     }
   ]
 }