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

chrome/browser/chromeos/extensions/file_manager/event_router.h

Index: chrome/browser/chromeos/extensions/file_manager/event_router.h
diff --git a/chrome/browser/chromeos/extensions/file_manager/event_router.h b/chrome/browser/chromeos/extensions/file_manager/event_router.h
index 7e094d6a1926f7a9a24149e389bd7ba7a530c60b..65e875e5cd2b9460d04988c595d3d3c44f09c83e 100644
--- a/chrome/browser/chromeos/extensions/file_manager/event_router.h
+++ b/chrome/browser/chromeos/extensions/file_manager/event_router.h
@@ -181,11 +181,6 @@ class EventRouter
   void ShowRemovableDeviceInFileManager(VolumeType type,
                                         const base::FilePath& mount_path);
 
-  // Sends onFileTranferUpdated to extensions if needed. If |always| is true,
-  // it sends the event always. Otherwise, it sends the event if enough time has
-  // passed from the previous event so as not to make extension busy.
-  void SendDriveFileTransferEvent(bool always);
-
   // Manages the list of currently active Drive file transfer jobs.
   struct DriveJobInfoWithStatus {
     DriveJobInfoWithStatus();
@@ -194,9 +189,20 @@ class EventRouter
     drive::JobInfo job_info;
     std::string status;
   };
+
+  // Schedule onFileTransferUpdated event.
+  void ScheduleDriveFileTransferEvent(const drive::JobInfo& job_info,
+                                      const std::string& status,
+                                      bool immediate);
+
+  // Sends onFileTranferUpdated to extensions if after nextSendTime_.
+  void SendDriveFileTransferEvent();
+
   std::map<drive::JobID, DriveJobInfoWithStatus> drive_jobs_;
+  scoped_ptr<DriveJobInfoWithStatus> drive_job_info_with_status_;
   base::Time last_file_transfer_event_;
   base::Time last_copy_progress_event_;
+  base::Time next_send_file_transfer_event_;
 
   WatcherMap file_watchers_;
   scoped_ptr<PrefChangeRegistrar> pref_change_registrar_;