Convert to CupsPrintJobManagerImpl to TaskScheduler.

chrome/browser/chromeos/printing/cups_print_job_manager_impl.h

 // Copyright 2017 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_CHROMEOS_PRINTING_CUPS_PRINT_JOB_MANAGER_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_PRINTING_CUPS_PRINT_JOB_MANAGER_IMPL_H_
 
 #include <map>
 #include <memory>
 #include <string>
 #include <unordered_map>
 #include <vector>
 
+#include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "base/sequenced_task_runner.h"
+#include "base/single_thread_task_runner.h"
 #include "chrome/browser/chromeos/printing/cups_print_job.h"
 #include "chrome/browser/chromeos/printing/cups_print_job_manager.h"
 #include "chrome/browser/chromeos/printing/printers_manager.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "printing/backend/cups_connection.h"
 
 class Profile;
 
 namespace chromeos {
 
 struct QueryResult {
   QueryResult();
   QueryResult(const QueryResult& other);
   ~QueryResult();
 
   bool success;
   std::vector<::printing::QueueStatus> queues;
 };
 
 class CupsPrintJobManagerImpl : public CupsPrintJobManager,
                                 public content::NotificationObserver {
  public:
-  explicit CupsPrintJobManagerImpl(Profile* profile);
+  CupsPrintJobManagerImpl(
+      Profile* profile,
+      scoped_refptr<base::SingleThreadTaskRunner> browser_thread_runner);
   ~CupsPrintJobManagerImpl() override;
 
   // CupsPrintJobManager overrides:
   void CancelPrintJob(CupsPrintJob* job) override;
   bool SuspendPrintJob(CupsPrintJob* job) override;
   bool ResumePrintJob(CupsPrintJob* job) override;
 
   // NotificationObserver overrides:
   void Observe(int type,
                const content::NotificationSource& source,
@@ skipping 38 matching lines @@
   std::map<std::string, std::unique_ptr<CupsPrintJob>> jobs_;
 
   // Prevents multiple queries from being scheduled simultaneously.
   bool in_query_ = false;
 
   // Records the number of consecutive times the GetJobs query has failed.
   int retry_count_ = 0;
 
   ::printing::CupsConnection cups_connection_;
   content::NotificationRegistrar registrar_;
+  scoped_refptr<base::SingleThreadTaskRunner> browser_thread_runner_;
+  scoped_refptr<base::SequencedTaskRunner> query_runner_;
   base::WeakPtrFactory<CupsPrintJobManagerImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CupsPrintJobManagerImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PRINTING_CUPS_PRINT_JOB_MANAGER_IMPL_H_