NOT FOR SUBMIT: use counters for jdm@

third_party/WebKit/Source/core/events/PopStateEvent.idl

 /*
  * Copyright (C) 2009 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 
 // https://html.spec.whatwg.org/multipage/browsers.html#the-popstateevent-interface
 
 [
     Constructor(DOMString type, optional PopStateEventInit eventInitDict),
     // TODO(foolip): Exposed=(Window,Worker)
 ] interface PopStateEvent : Event {
-    [Custom=Getter] readonly attribute any state;
+    [Custom=Getter, Measure] readonly attribute any state;
 };