Introduce ServiceWorker.EventDispatchingDelay UMA

content/renderer/background_sync/background_sync_client_impl.cc

 // Copyright 2015 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/renderer/background_sync/background_sync_client_impl.h"
 
 #include <utility>
 
+#include "base/time/time.h"
 #include "content/child/background_sync/background_sync_provider.h"
 #include "content/child/background_sync/background_sync_type_converters.h"
 #include "content/renderer/service_worker/service_worker_context_client.h"
 #include "third_party/WebKit/public/platform/Platform.h"
 #include "third_party/WebKit/public/platform/WebThread.h"
 #include "third_party/WebKit/public/platform/modules/background_sync/WebSyncProvider.h"
 #include "third_party/WebKit/public/platform/modules/background_sync/WebSyncRegistration.h"
 #include "third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextProxy.h"
 
 namespace content {
@@ skipping 12 matching lines @@
 
 void BackgroundSyncClientImpl::Sync(
     const mojo::String& tag,
     blink::mojom::BackgroundSyncEventLastChance last_chance,
     const SyncCallback& callback) {
   DCHECK(!blink::Platform::current()->mainThread()->isCurrentThread());
 
   ServiceWorkerContextClient* client =
       ServiceWorkerContextClient::ThreadSpecificInstance();
   if (!client) {
-    callback.Run(blink::mojom::ServiceWorkerEventStatus::ABORTED);
+    callback.Run(blink::mojom::ServiceWorkerEventStatus::ABORTED,
+                 base::Time::Now().ToDoubleT());
     return;
   }
 
   blink::WebServiceWorkerContextProxy::LastChanceOption web_last_chance =
       mojo::ConvertTo<blink::WebServiceWorkerContextProxy::LastChanceOption>(
           last_chance);
 
   client->DispatchSyncEvent(tag, web_last_chance, callback);
 }
 
 }  // namespace content