Invalidate non-self-painting-layer descendants when creating a layer

third_party/WebKit/LayoutTests/compositing/repaint/should-not-repaint-composited-descendants-on-overflow-change-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [0, 200, 200, 200],
-        [0, 200, 200, 200],
         [0, 0, 200, 200]
       ],
       "paintInvalidationClients": [
         "LayoutBlockFlow DIV id='overflow1'",
         "LayoutBlockFlow DIV id='overflow2'"
       ],
       "children": [
         {
           "bounds": [100, 100],
           "contentsOpaque": true,
@@ skipping 36 matching lines @@
               "backfaceVisibility": "hidden",
               "backgroundColor": "#008000"
             }
           ]
         }
       ]
     }
   ]
 }