Enrich fileBrowserPrivate.onFileTransfersUpdated event to support displaying total number of jobs.

chrome/browser/chromeos/drive/job_list.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 CHROME_BROWSER_CHROMEOS_DRIVE_JOB_LIST_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_JOB_LIST_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 71 matching lines @@
   int64 num_total_bytes;
 
   // Drive path of the file that this job acts on.
   base::FilePath file_path;
 
   // Time when the job is started (i.e. the request is sent to the server).
   base::Time start_time;
 
   // Returns the string representation of the job info.
   std::string ToString() const;
+
+  // Total number of jobs.
+  long num_total_jobs;

[kinaba, 2014/09/02 05:01:39]

JobInfo is a structure to represent the status of each single jobs.
It looks strange that it includes the info of whole job list.

Rather than adding it to the field, wouldn't it be possible to obtain the data
by, for instance, calling GetJobInfoList().size() in each listener?
(If it is too inefficient, you can add a new method to get just the number
in JobList class)

[iseki, 2014/09/02 10:01:42]

Now, EventRouter can not call GetJobInfoList().size(). EventRouter needs to have
the instance of JobScheduler to call it.

 };
 
 // Checks if |job_info| represents a job for currently active file transfer.
 bool IsActiveFileTransferJobInfo(const JobInfo& job_info);
 
 // The interface for observing JobListInterface.
 // All events are notified in the UI thread.
 class JobListObserver {
  public:
   // Called when a new job id added.
@@ skipping 29 matching lines @@
   // Cancels the job.
   virtual void CancelJob(JobID job_id) = 0;
 
   // Cancels all the jobs.
   virtual void CancelAllJobs() = 0;
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_JOB_LIST_H_