SyncFS: Introduce RemoteSyncOperationResolver for directory operation support

webkit/fileapi/syncable/file_change.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 WEBKIT_FILEAPI_SYNCABLE_FILE_CHANGE_H_
 #define WEBKIT_FILEAPI_SYNCABLE_FILE_CHANGE_H_
 
 #include <deque>
 #include <string>
 
@@ skipping 44 matching lines @@
   ~FileChangeList();
 
   // Updates the list with the |new_change|.
   void Update(const FileChange& new_change);
 
   size_t size() const { return list_.size(); }
   bool empty() const { return list_.empty(); }
   void clear() { list_.clear(); }
   const List& list() const { return list_; }
   const FileChange& front() const { return list_.front(); }
+  const FileChange& back() const { return list_.back(); }
 
   FileChangeList PopAndGetNewList() const;
 
   std::string DebugString() const;
 
  private:
   List list_;
 };
 
 }  // namespace sync_file_system
 
 #endif  // WEBKIT_FILEAPI_SYNCABLE_FILE_CHANGE_H_