Wired support for file truncating with RemoteFileSystemOperation::OpenFile() method (case when base…

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 207 matching lines @@
   //
   // |peer_handle| is the process handle of a pepper plugin process, which
   // is necessary for underlying IPC calls with Pepper plugins.
   //
   // This function is used only by Pepper as of writing.
   virtual void OpenFile(const GURL& path,
                         int file_flags,
                         base::ProcessHandle peer_handle,
                         const OpenFileCallback& callback) = 0;
 
+  // Signals that the file at |path|, which was previously opened with
+  // OpenFile() call, has been closed by the caller.
+  //
+  // This function is used to give remote file systems providers opportunity to
+  // process locally modified files.
+  //
+  // This function is used only by Pepper as of writing.
+  virtual void NotifyFileClosed(const GURL& path,
+                                const StatusCallback& callback) = 0;
+
   // For downcasting to FileSystemOperation.
   // TODO(kinuko): this hack should go away once appropriate upload-stream
   // handling based on element types is supported.
   virtual FileSystemOperation* AsFileSystemOperation() = 0;
 
   // Creates a local snapshot file for a given |path| and returns the
   // metadata and platform path of the snapshot file via |callback|.
   // In local filesystem cases the implementation may simply return
   // the metadata of the file itself (as well as GetMetadata does),
   // while in remote filesystem case the backend may want to download the file
@@ skipping 16 matching lines @@
     kOperationFileExists,
     kOperationGetMetadata,
     kOperationReadDirectory,
     kOperationRemove,
     kOperationWrite,
     kOperationTruncate,
     kOperationTouchFile,
     kOperationOpenFile,
     kOperationGetLocalPath,
     kOperationCancel,
+    kOperationFileClosed,
   };
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_OPERATION_INTERFACE_H_