NOT FOR SUBMIT: use counters for jdm@

third_party/WebKit/Source/modules/serviceworkers/WindowClient.idl

 // Copyright 2014 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://w3c.github.io/ServiceWorker/#context-frame-type-enum
 enum ContextFrameType {
     "top-level",
     "nested",
     "auxiliary",
     "none"
 };
 
 // https://w3c.github.io/ServiceWorker/#window-client-interface
 [
     Exposed=ServiceWorker,
     ImplementedAs=ServiceWorkerWindowClient,
 ] interface WindowClient : Client {
-    readonly attribute VisibilityState visibilityState;
-    readonly attribute boolean focused;
-    [CallWith=ScriptState] Promise<WindowClient> focus();
-    [CallWith=ScriptState] Promise<WindowClient> navigate(USVString url);
+    [Measure] readonly attribute VisibilityState visibilityState;
+    [Measure] readonly attribute boolean focused;
+  [Measure, CallWith=ScriptState] Promise<WindowClient> focus();
+  [Measure, CallWith=ScriptState] Promise<WindowClient> navigate(USVString url);
 };