Storage manager: Update storage usage periodically.

chrome/browser/ui/webui/options/chromeos/storage_manager_handler.h

 // Copyright 2016 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_UI_WEBUI_OPTIONS_CHROMEOS_STORAGE_MANAGER_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_CHROMEOS_STORAGE_MANAGER_HANDLER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 91 matching lines @@
   // The list of other users whose directory sizes will be accumulated as the
   // size of "Other users".
   user_manager::UserList other_users_;
 
   // Fetched sizes of user directories.
   std::vector<int64_t> user_sizes_;
 
   // Helper to compute the total size of all types of site date.
   std::unique_ptr<SiteDataSizeCollector> site_data_size_collector_;
 
+  // Flags indicating fetch operations for storage sizes are ongoing.
+  bool updating_downloads_size_;
+  bool updating_drive_cache_size_;
+  bool updating_browsing_data_size_;
+  bool updating_arc_size_;
+  bool updating_other_users_size_;
+
   base::WeakPtrFactory<StorageManagerHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(StorageManagerHandler);
 };
 
 }  // namespace options
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_CHROMEOS_STORAGE_MANAGER_HANDLER_H_