Introduce ServiceWorker.EventDispatchingDelay UMA

content/renderer/service_worker/service_worker_context_client.h

 // 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.
 
 #ifndef CONTENT_RENDERER_SERVICE_WORKER_SERVICE_WORKER_CONTEXT_CLIENT_H_
 #define CONTENT_RENDERER_SERVICE_WORKER_SERVICE_WORKER_CONTEXT_CLIENT_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 118 matching lines @@
   blink::WebDevToolsAgentClient::WebKitClientMessageLoop*
   createDevToolsMessageLoop() override;
   void didHandleActivateEvent(int request_id,
                               blink::WebServiceWorkerEventResult) override;
   void didHandleExtendableMessageEvent(
       int request_id,
       blink::WebServiceWorkerEventResult result) override;
   void didHandleInstallEvent(
       int request_id,
       blink::WebServiceWorkerEventResult result) override;
-  void respondToFetchEvent(int response_id) override;
-  void respondToFetchEvent(
-      int response_id,
-      const blink::WebServiceWorkerResponse& response) override;
+  void respondToFetchEvent(int response_id,
+                           double event_dispatch_time) override;
+  void respondToFetchEvent(int response_id,
+                           const blink::WebServiceWorkerResponse& response,
+                           double event_dispatch_time) override;
   void didHandleFetchEvent(int event_finish_id,
                            blink::WebServiceWorkerEventResult result) override;
   void didHandleNotificationClickEvent(
       int request_id,
       blink::WebServiceWorkerEventResult result) override;
   void didHandleNotificationCloseEvent(
       int request_id,
       blink::WebServiceWorkerEventResult result) override;
   void didHandlePushEvent(int request_id,
                           blink::WebServiceWorkerEventResult result) override;
@@ skipping 99 matching lines @@
   // Initialized on the worker thread in workerContextStarted and
   // destructed on the worker thread in willDestroyWorkerContext.
   std::unique_ptr<WorkerContextData> context_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerContextClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_SERVICE_WORKER_SERVICE_WORKER_CONTEXT_CLIENT_H_