Componentize StartupTaskRunnerService

chrome/browser/profiles/startup_task_runner_service.h

-// Copyright (c) 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 CHROME_BROWSER_PROFILES_STARTUP_TASK_RUNNER_SERVICE_H_
-#define CHROME_BROWSER_PROFILES_STARTUP_TASK_RUNNER_SERVICE_H_
-
-#include "base/basictypes.h"
-#include "base/memory/ref_counted.h"
-#include "base/threading/non_thread_safe.h"
-#include "components/keyed_service/core/keyed_service.h"
-
-class Profile;
-
-namespace base {
-class DeferredSequencedTaskRunner;
-}  // namespace base
-
-// This service manages the startup task runners.
-class StartupTaskRunnerService : public base::NonThreadSafe,
-                                 public KeyedService {
- public:
-  explicit StartupTaskRunnerService(Profile* profile);
-  ~StartupTaskRunnerService() override;
-
-  // Returns sequenced task runner where all bookmarks I/O operations are
-  // performed.
-  // This method should only be called from the UI thread.
-  // Note: Using a separate task runner per profile service gives a better
-  // management of the sequence in which the task are started in order to avoid
-  // congestion during start-up (e.g the caller may decide to start loading the
-  // bookmarks only after the history finished).
-  scoped_refptr<base::DeferredSequencedTaskRunner> GetBookmarkTaskRunner();
-
-  // Starts the task runners that are deferred during start-up.
-  void StartDeferredTaskRunners();
-
- private:
-  Profile* profile_;
-  scoped_refptr<base::DeferredSequencedTaskRunner> bookmark_task_runner_;
-
-  DISALLOW_COPY_AND_ASSIGN(StartupTaskRunnerService);
-};
-
-#endif  // CHROME_BROWSER_PROFILES_STARTUP_TASK_RUNNER_SERVICE_H_