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

content/browser/service_worker/service_worker_url_request_job.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_BROWSER_SERVICE_WORKER_SERVICE_WORKER_URL_REQUEST_JOB_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_URL_REQUEST_JOB_H_
 
 #include <map>
 #include <string>
 
@@ skipping 94 matching lines @@
 
   // Creates ServiceWorkerFetchRequest from |request_| and |body_|.
   scoped_ptr<ServiceWorkerFetchRequest> CreateFetchRequest();
 
   // Creates BlobDataHandle of the request body from |body_|. This handle
   // |request_body_blob_data_handle_| will be deleted when
   // ServiceWorkerURLRequestJob is deleted.
   bool CreateRequestBodyBlob(std::string* blob_uuid, uint64* blob_size);
 
   // For FORWARD_TO_SERVICE_WORKER case.
+  void DidPrepareFetchEvent();
   void DidDispatchFetchEvent(ServiceWorkerStatusCode status,
                              ServiceWorkerFetchEventResult fetch_result,
                              const ServiceWorkerResponse& response);
 
   // Populates |http_response_headers_|.
   void CreateResponseHeader(int status_code,
                             const std::string& status_text,
                             const std::map<std::string, std::string>& headers);
 
   // Creates |http_response_info_| using |http_response_headers_| and calls
@@ skipping 25 matching lines @@
   scoped_ptr<storage::BlobDataHandle> request_body_blob_data_handle_;
 
   base::WeakPtrFactory<ServiceWorkerURLRequestJob> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerURLRequestJob);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_URL_REQUEST_JOB_H_