Notify CloseFile from Pepper to FileSystem.

webkit/fileapi/file_system_operation_interface.h

Index: webkit/fileapi/file_system_operation_interface.h
diff --git a/webkit/fileapi/file_system_operation_interface.h b/webkit/fileapi/file_system_operation_interface.h
index 0583b9412753ec52bbe89c735318c992652afb96..6dbcc776ed4263b2944d736c2f4ec76ec27d107f 100644
--- a/webkit/fileapi/file_system_operation_interface.h
+++ b/webkit/fileapi/file_system_operation_interface.h
@@ -225,6 +225,14 @@ class FileSystemOperationInterface {
                         base::ProcessHandle peer_handle,
                         const OpenFileCallback& callback) = 0;
 
+  // Notifies a file at |path| opened by OpenFile is closed in plugin process.
+  // File system will run some cleanup task such as uploading the modified file
+  // content to a remote storage.
+  //
+  // This function is used only by Pepper as of writing.
+  virtual void NotifyCloseFile(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.