Add use counters for lots of DOM APIs.

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

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 // https://html.spec.whatwg.org/multipage/browsers.html#the-hashchangeevent-interface
 
 [
     Constructor(DOMString type, optional HashChangeEventInit eventInitDict),
     // TODO(foolip): Exposed=(Window,Worker)
 ] interface HashChangeEvent : Event {
-    readonly attribute DOMString oldURL;
-    readonly attribute DOMString newURL;
+    [Measure] readonly attribute DOMString oldURL;
+    [Measure] readonly attribute DOMString newURL;
 };