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

third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/bugzilla-5699-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow P",
           "rect": [8, 136, 784, 68],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutText #text",
-          "rect": [8, 184, 32, 19],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [8, 156, 32, 19],
-          "reason": "forced by layout"
-        },
-        {
-          "object": "LayoutInline SPAN id='d'",
-          "rect": [8, 150, 4, 19],
-          "reason": "style change"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [8, 150, 4, 19],
-          "reason": "style change"
-        },
-        {
-          "object": "LayoutText #text",
           "rect": [8, 136, 4, 19],
           "reason": "style change"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow P",
       "reason": "forced by layout"
@@ skipping 38 matching lines @@
       "object": "LayoutBR BR",
       "reason": "forced by layout"
     },
     {
       "object": "InlineTextBox '\n'",
       "reason": "forced by layout"
     }
   ]
 }