Implement stream based cross file system copy.

webkit/common/fileapi/file_system_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_COMMON_FILEAPI_FILE_SYSTEM_UTIL_H_
 #define WEBKIT_COMMON_FILEAPI_FILE_SYSTEM_UTIL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 140 matching lines @@
     const GURL& origin_url,
     const std::string& filesystem_id,
     const std::string& optional_root_name);
 
 // Returns the root URI for an external filesystem for origin |origin_url|
 // and |mount_name|.
 WEBKIT_STORAGE_COMMON_EXPORT std::string GetExternalFileSystemRootURIString(
     const GURL& origin_url,
     const std::string& mount_name);
 
+// Translates the net::Error to base::PlatformFileError.
+WEBKIT_STORAGE_COMMON_EXPORT base::PlatformFileError
+NetErrorToPlatformFileError(int error);
+
 }  // namespace fileapi
 
 #endif  // WEBKIT_COMMON_FILEAPI_FILE_SYSTEM_UTIL_H_