Introduce ServiceWorker.EventDispatchingDelay UMA

third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 106 matching lines @@
     // Called after ExtendableMessageEvent is handled by the ServiceWorker's
     // script context.
     virtual void didHandleExtendableMessageEvent(int eventID, WebServiceWorkerEventResult result) { }
 
     // ServiceWorker specific methods. respondFetchEvent will be called after
     // FetchEvent returns a response by the ServiceWorker's script context, and
     // didHandleFetchEvent will be called after the end of FetchEvent's
     // lifecycle. When no response is provided, the browser should fallback to
     // native fetch. EventIDs are the same with the ids passed from
     // dispatchFetchEvent respectively.
-    virtual void respondToFetchEvent(int responseID) { };
-    virtual void respondToFetchEvent(int responseID, const WebServiceWorkerResponse& response) { };
+    virtual void respondToFetchEvent(int responseID, double eventDispatchTime) { };
+    virtual void respondToFetchEvent(int responseID, const WebServiceWorkerResponse& response, double eventDispatchTime) { };
     virtual void didHandleFetchEvent(int eventFinishID, WebServiceWorkerEventResult result) { };
 
     // ServiceWorker specific method. Called after InstallEvent (dispatched
     // via WebServiceWorkerContextProxy) is handled by the ServiceWorker's
     // script context.
     virtual void didHandleInstallEvent(int installEventID, WebServiceWorkerEventResult result) { }
 
     // ServiceWorker specific method. Called after NotificationClickEvent
     // (dispatched via WebServiceWorkerContextProxy) is handled by the
     // ServiceWorker's script context.
@@ skipping 73 matching lines @@
     virtual void navigate(const WebString& uuid, const WebURL&, WebServiceWorkerClientCallbacks*) = 0;
 
     // Called when the worker wants to register subscopes to handle via foreign
     // fetch. Will only be called while an install event is in progress.
     virtual void registerForeignFetchScopes(const WebVector<WebURL>& subScopes, const WebVector<WebSecurityOrigin>& origins) = 0;
 };
 
 } // namespace blink
 
 #endif // WebServiceWorkerContextClient_h