Service Worker: Respect the "clear on exit" content setting

content/browser/service_worker/service_worker_database_task_manager.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_DATABASE_TASK_RUNNER_MANAGER_
+#define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DATABASE_TASK_RUNNER_MANAGER_
+
+#include "base/memory/ref_counted.h"
+#include "content/common/content_export.h"
+
+namespace base {
+class SequencedTaskRunner;
+}
+
+namespace content {
+
+// Used to sequence ServiceWorkerDatabase tasks. Vends two task runners: one
+// that blocks shutdown and one that doesn't. The task runners use the same
+// sequence token, so no matter which runner you post to, the tasks run in the
+// order they are posted. This lets you post sequenced tasks with mixed shutdown
+// behaviors.
+class ServiceWorkerDatabaseTaskManager {
+ public:
+  virtual ~ServiceWorkerDatabaseTaskManager(){};
+  virtual scoped_ptr<ServiceWorkerDatabaseTaskManager> Clone() = 0;
+  virtual base::SequencedTaskRunner* GetTaskRunner() = 0;
+  virtual base::SequencedTaskRunner* GetShutdownBlockingTaskRunner() = 0;
+};
+
+class ServiceWorkerDatabaseTaskManagerImpl
+    : public ServiceWorkerDatabaseTaskManager {
+ public:
+  explicit ServiceWorkerDatabaseTaskManagerImpl(
+      base::SequencedWorkerPool* pool);
+  virtual ~ServiceWorkerDatabaseTaskManagerImpl();
+
+ protected:
+  virtual scoped_ptr<ServiceWorkerDatabaseTaskManager> Clone() override;
+  virtual base::SequencedTaskRunner* GetTaskRunner() override;
+  virtual base::SequencedTaskRunner* GetShutdownBlockingTaskRunner() override;
+
+ private:
+  ServiceWorkerDatabaseTaskManagerImpl(
+      const scoped_refptr<base::SequencedTaskRunner>& task_runner,
+      const scoped_refptr<base::SequencedTaskRunner>&
+          shutdown_blocking_task_runner);
+
+  scoped_refptr<base::SequencedTaskRunner> task_runner_;
+  scoped_refptr<base::SequencedTaskRunner> shutdown_blocking_task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(ServiceWorkerDatabaseTaskManagerImpl);
+};
+
+// Dummy implementation for testing. It vends whatever you give it in the ctor.
+class CONTENT_EXPORT MockServiceWorkerDatabaseTaskManager
+    : public NON_EXPORTED_BASE(ServiceWorkerDatabaseTaskManager) {
+ public:
+  explicit MockServiceWorkerDatabaseTaskManager(
+      const scoped_refptr<base::SequencedTaskRunner>& task_runner);
+  virtual ~MockServiceWorkerDatabaseTaskManager();
+
+ protected:
+  virtual scoped_ptr<ServiceWorkerDatabaseTaskManager> Clone() override;
+  virtual base::SequencedTaskRunner* GetTaskRunner() override;
+  virtual base::SequencedTaskRunner* GetShutdownBlockingTaskRunner() override;
+
+ private:
+  scoped_refptr<base::SequencedTaskRunner> task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(MockServiceWorkerDatabaseTaskManager);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DATABASE_TASK_RUNNER_MANAGER_