ServiceWorker: Migrate the script cache backend from BlockFile to Simple

content/browser/service_worker/service_worker_disk_cache_migrator.h

 // 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/browser/service_worker/service_worker_disk_cache.h"
 
 #include "base/id_map.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/service_worker/service_worker_database.h"
 #include "content/common/service_worker/service_worker_status_code.h"
@@ skipping 39 matching lines @@
 
   scoped_ptr<disk_cache::Backend::Iterator> iterator_;
   ServiceWorkerDiskCache* src_;
   ServiceWorkerDiskCache* dest_;
 
   InflightTaskMap::KeyType next_task_id_ = 0;
   InflightTaskMap inflight_tasks_;
   scoped_ptr<Task> pending_task_;
   size_t max_number_of_inflight_tasks_ = 10;
 
+  base::TimeTicks start_time_;
+  size_t number_of_migrated_resources_ = 0;
+
   StatusCallback callback_;
 
   base::WeakPtrFactory<ServiceWorkerDiskCacheMigrator> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerDiskCacheMigrator);
 };
 
 }  // namespace content