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

third_party/WebKit/LayoutTests/platform/linux/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, 526],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutText #text",
-          "rect": [13, 240, 408, 139],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
           "rect": [13, 500, 408, 99],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutText #text",
-          "rect": [13, 480, 408, 99],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [14, 180, 406, 79],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [13, 440, 356, 59],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [14, 80, 355, 119],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [14, 420, 355, 59],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [14, 380, 354, 59],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [65, 380, 304, 59],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [14, 380, 298, 19],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [65, 380, 287, 19],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [134, 360, 131, 19],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [83, 360, 131, 19],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
           "rect": [303, 420, 66, 19],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutText #text",
           "rect": [143, 420, 64, 19],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow (floating) SPAN id='blueFloat'",
@@ skipping 254 matching lines @@
       "object": "InlineTextBox 'They\u2019re dreadfully fond of beheading people here; the great'",
       "reason": "forced by layout"
     },
     {
       "object": "InlineTextBox 'wonder is, that there\u2018s any one left alive!\u2019'",
       "reason": "forced by layout"
     }
   ]
 }