NOT FOR SUBMIT: use counters for jdm@

third_party/WebKit/Source/core/frame/ImageBitmap.idl

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // https://html.spec.whatwg.org/#images
 
 [
     Exposed=(Window,Worker),
 ] interface ImageBitmap {
-    readonly attribute unsigned long width;
-    readonly attribute unsigned long height;
-    void close();
+    [Measure] readonly attribute unsigned long width;
+    [Measure] readonly attribute unsigned long height;
+    [Measure] void close();
 };