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

chrome/browser/chromeos/drive/job_scheduler.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/chromeos/drive/job_scheduler.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/pref_service.h"
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 697 matching lines @@
   DoJobLoop(GetJobQueueType(job->job_info.job_type));
 }
 
 void JobScheduler::QueueJob(JobID job_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   JobEntry* job_entry = job_map_.Lookup(job_id);
   DCHECK(job_entry);
   const JobInfo& job_info = job_entry->job_info;
 
-  QueueType queue_type = GetJobQueueType(job_info.job_type);
+  const QueueType queue_type = GetJobQueueType(job_info.job_type);
   queue_[queue_type]->Push(job_id, job_entry->context.type);
 
   const std::string retry_prefix = job_entry->retry_count > 0 ?
       base::StringPrintf(" (retry %d)", job_entry->retry_count) : "";
   logger_->Log(logging::LOG_INFO,
                "Job queued%s: %s - %s",
                retry_prefix.c_str(),
                job_info.ToString().c_str(),
                GetQueueInfo(queue_type).c_str());
 }
@@ skipping 404 matching lines @@
     case FILE_QUEUE:
       return "FILE_QUEUE";
     case NUM_QUEUES:
       break;  // This value is just a sentinel. Should never be used.
   }
   NOTREACHED();
   return "";
 }
 
 }  // namespace drive