drive: Pass through AboutResouce from server among callbacks in ChangeListLoader.

chrome/browser/chromeos/drive/change_list_loader.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_CHANGE_LIST_LOADER_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_CHANGE_LIST_LOADER_H_
 
 #include <string>
 
 #include "base/callback_forward.h"
@@ skipping 219 matching lines @@
   DriveScheduler* scheduler_;  // Not owned.
   DriveWebAppsRegistry* webapps_registry_;  // Not owned.
   DriveCache* cache_;  // Not owned.
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
   ObserverList<ChangeListLoaderObserver> observers_;
   scoped_ptr<ChangeListProcessor> change_list_processor_;
 
   // Indicates whether there is a feed refreshing server request is in flight.
   bool refreshing_;
 
+  // Resource ID for the user's "My Drive" root. This must be retrieved from
+  // the server.
+  std::string drive_root_resource_id_;
+
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<ChangeListLoader> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(ChangeListLoader);
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_CHANGE_LIST_LOADER_H_