Generate flag-specific baselines for some spv2 and spvinvalidation tests

third_party/WebKit/LayoutTests/flag-specific/enable-blink-features=SlimmingPaintInvalidation/paint/invalidation/outline-clip-change-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow (positioned) A id='link' class='updated'",
-          "rect": [43, 103, 91, 30],
+          "rect": [48, 108, 86, 25],
           "reason": "subtree"
         },
         {
           "object": "LayoutText #text",
           "rect": [48, 108, 81, 19],
           "reason": "subtree"
         }
       ]
     }
   ],
@@ skipping 10 matching lines @@
       "object": "LayoutText #text",
       "reason": "subtree"
     },
     {
       "object": "InlineTextBox 'Lorem Ipsum'",
       "reason": "subtree"
     }
   ]
 }