Add use counters for lots of DOM APIs.

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

Index: third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.idl
diff --git a/third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.idl b/third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.idl
index 5ae229129270c3a7deedb0a70ebef14d3e601cbd..4d7a394e8e3327e2f02cd5fdcbe3fe05d4ac1daf 100644
--- a/third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.idl
+++ b/third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.idl
@@ -43,12 +43,12 @@ enum ServiceWorkerState {
     DependentLifetime,
 ] interface ServiceWorker : EventTarget {
 
-    [PostMessage, RaisesException] void postMessage(SerializedScriptValue message, optional sequence<Transferable> transfer);
+  [Measure, PostMessage, RaisesException] void postMessage(SerializedScriptValue message, optional sequence<Transferable> transfer);
 
-    readonly attribute USVString scriptURL;
-    readonly attribute ServiceWorkerState  state;
+    [Measure] readonly attribute USVString scriptURL;
+    [Measure] readonly attribute ServiceWorkerState  state;
 
-    attribute EventHandler onstatechange;
+    [Measure] attribute EventHandler onstatechange;
 };
 
 ServiceWorker implements AbstractWorker;