drive: Add "Delta Update Status" section to chrome:drive-internals

chrome/browser/chromeos/drive/drive_file_system.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILE_SYSTEM_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILE_SYSTEM_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 710 matching lines @@
 
   // The document service owned by DriveSystemService.
   google_apis::DriveServiceInterface* drive_service_;
 
   // The webapps registry owned by DriveSystemService.
   DriveWebAppsRegistryInterface* webapps_registry_;
 
   // Periodic timer for checking updates.
   base::Timer update_timer_;
 
+  // Time of the last update check.
+  base::Time last_update_check_time_;
+
+  // Error of the last update check.
+  DriveFileError last_update_check_error_;
+
   // True if hosted documents should be hidden.
   bool hide_hosted_docs_;
 
   // The set of paths opened by OpenFile but not yet closed by CloseFile.
   std::set<FilePath> open_files_;
 
   scoped_ptr<PrefChangeRegistrar> pref_registrar_;
 
   // The loader is used to load the feeds.
   scoped_ptr<DriveFeedLoader> feed_loader_;
 
   ObserverList<DriveFileSystemObserver> observers_;
 
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
 
   file_system::DriveOperations drive_operations_;
 
   scoped_ptr<DriveScheduler> scheduler_;
 
+  // Polling interval for checking updates in seconds.
+  int polling_interval_sec_;
+
+  // True if push notification is enabled.
+  bool push_notification_enabled_;
+
   // WeakPtrFactory and WeakPtr bound to the UI thread.
   // Note: These should remain the last member so they'll be destroyed and
   // invalidate the weak pointers before any other members are destroyed.
   base::WeakPtrFactory<DriveFileSystem> ui_weak_ptr_factory_;
   // Unlike other classes, we need this as we need this to redirect a task
   // from IO thread to UI thread.
   base::WeakPtr<DriveFileSystem> ui_weak_ptr_;
-
-  // Polling interval for checking updates in seconds.
-  int polling_interval_sec_;
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILE_SYSTEM_H_