First implementation of lazily cached accessor for DOM attributes.

third_party/WebKit/Source/core/dom/Element.idl

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * 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,
@@ skipping 13 matching lines @@
 enum NativeScrollBehavior { "disable-native-scroll", "perform-before-native-scroll", "perform-after-native-scroll" };
 
 // https://dom.spec.whatwg.org/#interface-element
 
 interface Element : Node {
     readonly attribute DOMString? namespaceURI;
     readonly attribute DOMString? prefix;
     readonly attribute DOMString localName;
     readonly attribute DOMString tagName;
 
-    [CEReactions, Reflect] attribute DOMString id;
+    [CEReactions, Reflect, CachedAccessor=Lazy] attribute DOMString id;
     [CEReactions, Reflect=class] attribute DOMString className;
     [SameObject, CEReactions, PerWorldBindings, PutForwards=value] readonly attribute DOMTokenList classList;
     [Unscopable, CEReactions, Reflect] attribute DOMString slot;
 
     // Pointer Events
     // https://w3c.github.io/pointerevents/#extensions-to-the-element-interface
     [RuntimeEnabled=PointerEvent, RaisesException] void setPointerCapture (long pointerId);
     [RuntimeEnabled=PointerEvent, RaisesException] void releasePointerCapture (long pointerId);
     [RuntimeEnabled=PointerEvent] boolean hasPointerCapture (long pointerId);
 
@@ skipping 93 matching lines @@
     attribute EventHandler oncut;
     attribute EventHandler onpaste;
     attribute EventHandler onsearch;
     attribute EventHandler onselectstart;
     attribute EventHandler onwheel;
 };
 
 Element implements ParentNode;
 Element implements ChildNode;
 Element implements NonDocumentTypeChildNode;