Implement media path filter

webkit/fileapi/file_system_operation_interface.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_FILE_SYSTEM_OPERATION_INTERFACE_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_OPERATION_INTERFACE_H_
 
 #include <vector>
 
 #include "base/file_util_proxy.h"
@@ skipping 56 matching lines @@
       void(base::PlatformFileError result,
            const base::PlatformFileInfo& file_info,
            const FilePath& platform_path)> GetMetadataCallback;
 
   // Used for OpenFile(). |result| is the return code of the operation.
   typedef base::Callback<
       void(base::PlatformFileError result,
            base::PlatformFile file,
            base::ProcessHandle peer_handle)> OpenFileCallback;
 
+  // Used for ReadDirectoryCallback.
+  typedef std::vector<base::FileUtilProxy::Entry> FileEntryList;
+
   // Used for ReadDirectory(). |result| is the return code of the operation,
   // |file_list| is the list of files read, and |has_more| is true if some files
   // are yet to be read.
   typedef base::Callback<
       void(base::PlatformFileError result,
-           const std::vector<base::FileUtilProxy::Entry>& file_list,
+           const FileEntryList& file_list,
            bool has_more)> ReadDirectoryCallback;
 
   // Used for CreateSnapshotFile(). (Please see the comment at
   // CreateSnapshotFile() below for how the method is called)
   // |result| is the return code of the operation.
   // |file_info| is the metadata of the snapshot file created.
   // |platform_path| is the path to the snapshot file created.
   //
   // The snapshot file could simply be of the local file pointed by the given
   // filesystem URL in local filesystem cases; remote filesystems
@@ skipping 176 matching lines @@
     kOperationOpenFile,
     kOperationCloseFile,
     kOperationGetLocalPath,
     kOperationCancel,
   };
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_OPERATION_INTERFACE_H_