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

third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/svg/js-late-gradient-creation-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
-          "object": "LayoutSVGInlineText #text",
-          "rect": [33, 23, 697, 194],
-          "reason": "forced by layout"
-        },
-        {
           "object": "LayoutSVGText text",
           "rect": [33, 23, 697, 194],
           "reason": "style change"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutSVGText text",
@@ skipping 19 matching lines @@
       "object": "LayoutSVGGradientStop stop",
       "reason": "layoutObject insertion"
     },
     {
       "object": "LayoutSVGGradientStop stop",
       "reason": "layoutObject insertion"
     }
   ]
 }