ServiceWorker: Add prepare_callback in DispatchFetchEvent to notify the end of SW preparation.

content/browser/service_worker/service_worker_url_request_job.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_url_request_job.h"
 
 #include <map>
 #include <string>
 #include <vector>
 
@@ skipping 211 matching lines @@
       return;
 
     case FORWARD_TO_SERVICE_WORKER:
       DCHECK(provider_host_ && provider_host_->active_version());
       DCHECK(!fetch_dispatcher_);
       // Send a fetch event to the ServiceWorker associated to the
       // provider_host.
       fetch_dispatcher_.reset(new ServiceWorkerFetchDispatcher(
           CreateFetchRequest(),
           provider_host_->active_version(),
+          base::Bind(&ServiceWorkerURLRequestJob::DidPrepareFetchEvent,
+                     weak_factory_.GetWeakPtr()),
           base::Bind(&ServiceWorkerURLRequestJob::DidDispatchFetchEvent,
                      weak_factory_.GetWeakPtr())));
       fetch_dispatcher_->Run();
       return;
   }
 
   NOTREACHED();
 }
 
 scoped_ptr<ServiceWorkerFetchRequest>
@@ skipping 72 matching lines @@
     }
   }
 
   request_body_blob_data_handle_ =
       blob_storage_context_->AddFinishedBlob(blob_data.get());
   *blob_uuid = uuid;
   *blob_size = size;
   return true;
 }
 
+void ServiceWorkerURLRequestJob::DidPrepareFetchEvent() {
+  // TODO(shimazu): Set the timestamp to measure the time to launch SW
+  // This is related to this (http://crbug.com/401389)
+}
+
 void ServiceWorkerURLRequestJob::DidDispatchFetchEvent(
     ServiceWorkerStatusCode status,
     ServiceWorkerFetchEventResult fetch_result,
     const ServiceWorkerResponse& response) {
   fetch_dispatcher_.reset();
 
   // Check if we're not orphaned.
   if (!request())
     return;
 
@@ skipping 71 matching lines @@
 void ServiceWorkerURLRequestJob::DeliverErrorResponse() {
   // TODO(falken): Print an error to the console of the ServiceWorker and of
   // the requesting page.
   CreateResponseHeader(500,
                        "Service Worker Response Error",
                        std::map<std::string, std::string>());
   CommitResponseHeader();
 }
 
 }  // namespace content