Introduce ServiceWorker.EventDispatchingDelay UMA

content/browser/service_worker/service_worker_fetch_dispatcher.cc

 // 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.
 
 #include "content/browser/service_worker/service_worker_fetch_dispatcher.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
+#include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
 #include "content/browser/service_worker/embedded_worker_status.h"
 #include "content/browser/service_worker/service_worker_version.h"
 #include "content/common/service_worker/service_worker_messages.h"
 #include "content/common/service_worker/service_worker_utils.h"
 
 namespace content {
 
 namespace {
 
@@ skipping 53 matching lines @@
 // Helper to receive the fetch event response even if
 // ServiceWorkerFetchDispatcher has been destroyed.
 class ServiceWorkerFetchDispatcher::ResponseCallback {
  public:
   ResponseCallback(base::WeakPtr<ServiceWorkerFetchDispatcher> fetch_dispatcher,
                    ServiceWorkerVersion* version)
       : fetch_dispatcher_(fetch_dispatcher), version_(version) {}
 
   void Run(int request_id,
            ServiceWorkerFetchEventResult fetch_result,
-           const ServiceWorkerResponse& response) {
+           const ServiceWorkerResponse& response,
+           base::Time dispatch_event_time) {
     const bool handled =
         (fetch_result == SERVICE_WORKER_FETCH_EVENT_RESULT_RESPONSE);
-    if (!version_->FinishRequest(request_id, handled))
+    if (!version_->FinishRequest(request_id, handled, dispatch_event_time))
       NOTREACHED() << "Should only receive one reply per event";
 
     // |fetch_dispatcher| is null if the URLRequest was killed.
     if (fetch_dispatcher_)
       fetch_dispatcher_->DidFinish(request_id, fetch_result, response);
   }
 
  private:
   base::WeakPtr<ServiceWorkerFetchDispatcher> fetch_dispatcher_;
   // Owns |this|.
@@ skipping 150 matching lines @@
 }
 
 ServiceWorkerMetrics::EventType ServiceWorkerFetchDispatcher::GetEventType()
     const {
   if (request_->fetch_type == ServiceWorkerFetchType::FOREIGN_FETCH)
     return ServiceWorkerMetrics::EventType::FOREIGN_FETCH;
   return ResourceTypeToEventType(resource_type_);
 }
 
 }  // namespace content