Add use counters for lots of DOM APIs.

third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerRegistration.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/#service-worker-registration-obj
 [
     ActiveScriptWrappable,
     DependentLifetime,
     Exposed=(Window,Worker),
 ] interface ServiceWorkerRegistration : EventTarget {
-    readonly attribute ServiceWorker? installing;
-    readonly attribute ServiceWorker? waiting;
-    readonly attribute ServiceWorker? active;
+    [Measure] readonly attribute ServiceWorker? installing;
+    [Measure] readonly attribute ServiceWorker? waiting;
+    [Measure] readonly attribute ServiceWorker? active;
     [RuntimeEnabled=ServiceWorkerNavigationPreload] readonly attribute NavigationPreloadManager navigationPreload;
 
-    readonly attribute USVString scope;
+    [Measure] readonly attribute USVString scope;
 
-    [CallWith=ScriptState] Promise<void> update();
-    [CallWith=ScriptState] Promise<boolean> unregister();
+  [Measure, CallWith=ScriptState] Promise<void> update();
+  [Measure, CallWith=ScriptState] Promise<boolean> unregister();
 
-    attribute EventHandler onupdatefound;
+    [Measure] attribute EventHandler onupdatefound;
 };