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 5a0897032d224e4ecda67f46f27c8f78acfc20c7..9196f96f7020b18fc8edf7d57dae87453843271e 100644
--- a/webkit/fileapi/file_system_operation_interface.h
+++ b/webkit/fileapi/file_system_operation_interface.h
@@ -226,6 +226,13 @@ 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 FileSystemURL& path) = 0;
+
   // For downcasting to FileSystemOperation.
   // TODO(kinuko): this hack should go away once appropriate upload-stream
   // handling based on element types is supported.
@@ -260,6 +267,7 @@ class FileSystemOperationInterface {
     kOperationTruncate,
     kOperationTouchFile,
     kOperationOpenFile,
+    kOperationCloseFile,
     kOperationGetLocalPath,
     kOperationCancel,
   };