ServiceWorker: Create sequenced task runner for database

content/browser/service_worker/service_worker_storage.h

 // Copyright 2013 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_STORAGE_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_STORAGE_H_
 
 #include <map>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "content/browser/service_worker/service_worker_database.h"
 #include "content/common/content_export.h"
 #include "content/common/service_worker/service_worker_status_code.h"
 #include "url/gurl.h"
 
+namespace base {
+class SequencedTaskRunner;
+}
+
 namespace quota {
 class QuotaManagerProxy;
 }
 
 namespace content {
 
 class ServiceWorkerContextCore;
 class ServiceWorkerRegistration;
 class ServiceWorkerRegistrationInfo;
 class ServiceWorkerVersion;
 
 // This class provides an interface to store and retrieve ServiceWorker
 // registration data.
 class CONTENT_EXPORT ServiceWorkerStorage {
  public:
   typedef base::Callback<void(ServiceWorkerStatusCode status)> StatusCallback;
   typedef base::Callback<void(ServiceWorkerStatusCode status,
                               const scoped_refptr<ServiceWorkerRegistration>&
                                   registration)> FindRegistrationCallback;
   typedef base::Callback<
       void(const std::vector<ServiceWorkerRegistrationInfo>& registrations)>
           GetAllRegistrationInfosCallback;
   typedef base::Callback<
       void(ServiceWorkerStatusCode status, int result)>
           CompareCallback;
 
   ServiceWorkerStorage(const base::FilePath& path,
                        base::WeakPtr<ServiceWorkerContextCore> context,
+                       base::SequencedTaskRunner* database_task_runner,
                        quota::QuotaManagerProxy* quota_manager_proxy);
   ~ServiceWorkerStorage();
 
   // Finds registration for |document_url| or |pattern| or |registration_id|.
   // The Find methods will find stored and initially installing registrations.
   // Returns SERVICE_WORKER_OK with non-null registration if registration
   // is found, or returns SERVICE_WORKER_ERROR_NOT_FOUND if no matching
   // registration is found.  The FindRegistrationForPattern method is
   // guaranteed to return asynchronously. However, the methods to find
   // for |document_url| or |registration_id| may complete immediately
@@ skipping 71 matching lines @@
       RegistrationRefsById;
   RegistrationRefsById installing_registrations_;
 
   int64 last_registration_id_;
   int64 last_version_id_;
   int64 last_resource_id_;
   bool simulated_lazy_initted_;
 
   base::FilePath path_;
   base::WeakPtr<ServiceWorkerContextCore> context_;
+  scoped_refptr<base::SequencedTaskRunner> database_task_runner_;
   scoped_refptr<quota::QuotaManagerProxy> quota_manager_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerStorage);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_STORAGE_H_