Use job id from JobEventDetails to create CupsPrintJobs.

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>
@@ skipping 26 matching lines @@
   // NotificationObserver overrides:
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
  private:
   // Begin monitoring a print job for a given |printer_name| with the given
   // |title| with the pages |total_page_number|.
   bool CreatePrintJob(const std::string& printer_name,
                       const std::string& title,
+                      int job_id,
                       int total_page_number);
 
-  // Schedule a query of CUPS for print job status.
+  // Schedule a query of CUPS for print job status with the default delay.
   void ScheduleQuery();
+  // Schedule a query of CUPS for print job status with a delay of |delay|.
+  void ScheduleQuery(const base::TimeDelta& delay);
 
   // Query CUPS for print job status.
   void QueryCups();
 
   // Process jobs from CUPS and perform notifications.
   void UpdateJobs(const std::vector<::printing::CupsJob>& jobs);
 
   // Updates the state and performs the appropriate notifications.
   void JobStateUpdated(CupsPrintJob* job, CupsPrintJob::State new_state);
 
   // Ongoing print jobs.
   std::map<std::string, std::unique_ptr<CupsPrintJob>> jobs_;
 
+  // Prevents multiple queries from being scheduled simultaneously.
+  bool in_query_ = false;
+
   ::printing::CupsConnection cups_connection_;
   content::NotificationRegistrar registrar_;
   base::WeakPtrFactory<CupsPrintJobManagerImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CupsPrintJobManagerImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PRINTING_CUPS_PRINT_JOB_MANAGER_IMPL_H_