Moving chrome/browser/chromeos/drive/change_list* into components/drive

chrome/browser/chromeos/drive/change_list_loader_observer.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_OBSERVER_H_
-#define CHROME_BROWSER_CHROMEOS_DRIVE_CHANGE_LIST_LOADER_OBSERVER_H_
-
-namespace base {
-class FilePath;
-}  // namespace base
-
-namespace drive {
-class FileChange;
-namespace internal {
-
-// Interface for classes that need to observe events from ChangeListLoader.
-// All events are notified on UI thread.
-class ChangeListLoaderObserver {
- public:
-  // Triggered when the content of a directory is reloaded. The content may
-  // changed.  |directory_path| is a virtual directory path representing the
-  // reloaded directory.
-  virtual void OnDirectoryReloaded(const base::FilePath& directory_path) {}
-
-  // Triggered when content(s) in drive has been changed.
-  virtual void OnFileChanged(const FileChange& changed_files) {}
-
-  // Triggered when loading from the server is complete.
-  virtual void OnLoadFromServerComplete() {}
-
-  // Triggered when loading is complete for the first time, either from the
-  // the server or the cache. To be precise, for the latter case, we do not
-  // load anything from the cache. We just check that the resource metadata
-  // is stored locally thus can be used.
-  virtual void OnInitialLoadComplete() {}
-
- protected:
-  virtual ~ChangeListLoaderObserver() {}
-};
-
-}  // namespace internal
-}  // namespace drive
-
-#endif  // CHROME_BROWSER_CHROMEOS_DRIVE_CHANGE_LIST_LOADER_OBSERVER_H_