(For-try) Divide recursive Copy/Move into multiple async tasks

webkit/fileapi/local_file_util.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_LOCAL_FILE_UTIL_H_
 #define WEBKIT_FILEAPI_LOCAL_FILE_UTIL_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/platform_file.h"
@@ skipping 50 matching lines @@
       FilePath* local_file_path) OVERRIDE;
   virtual base::PlatformFileError Touch(
       FileSystemOperationContext* context,
       const FileSystemURL& url,
       const base::Time& last_access_time,
       const base::Time& last_modified_time) OVERRIDE;
   virtual base::PlatformFileError Truncate(
       FileSystemOperationContext* context,
       const FileSystemURL& url,
       int64 length) OVERRIDE;
-  virtual bool IsDirectoryEmpty(
-      FileSystemOperationContext* context,
-      const FileSystemURL& url) OVERRIDE;
   virtual base::PlatformFileError CopyOrMoveFile(
       FileSystemOperationContext* context,
       const FileSystemURL& src_url,
       const FileSystemURL& dest_url,
       bool copy) OVERRIDE;
   virtual base::PlatformFileError CopyInForeignFile(
       FileSystemOperationContext* context,
       const FilePath& src_file_path,
       const FileSystemURL& dest_url) OVERRIDE;
   virtual base::PlatformFileError DeleteFile(
       FileSystemOperationContext* context,
       const FileSystemURL& url) OVERRIDE;
-  virtual base::PlatformFileError DeleteSingleDirectory(
+  virtual base::PlatformFileError DeleteDirectory(
       FileSystemOperationContext* context,
       const FileSystemURL& url) OVERRIDE;
   virtual base::PlatformFileError CreateSnapshotFile(
       FileSystemOperationContext* context,
       const FileSystemURL& url,
       base::PlatformFileInfo* file_info,
       FilePath* platform_path,
       SnapshotFilePolicy* snapshot_policy) OVERRIDE;
 
  private:
   // Given the filesystem url, produces a real, full local path for the
   // underlying filesystem (which is usually the native filesystem).
   FileSystemURL GetLocalPath(
       FileSystemOperationContext* context,
       const FileSystemURL& url);
 
   DISALLOW_COPY_AND_ASSIGN(LocalFileUtil);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_LOCAL_FILE_UTIL_H_