Create ShareableFileReference on IO thread

webkit/fileapi/local_file_system_operation.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_LOCAL_FILE_SYSTEM_OPERATION_H_
 #define WEBKIT_FILEAPI_LOCAL_FILE_SYSTEM_OPERATION_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 208 matching lines @@
                     base::PlatformFileError rv);
   void DidOpenFile(const OpenFileCallback& callback,
                    base::PlatformFileError rv,
                    base::PassPlatformFile file,
                    bool created);
   void DidCreateSnapshotFile(
       const SnapshotFileCallback& callback,
       base::PlatformFileError rv,
       const base::PlatformFileInfo& file_info,
       const FilePath& platform_path,
-      const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref);
+      FileSystemFileUtil::SnapshotFilePolicy snapshot_policy);
 
   // Checks the validity of a given |url| and populates |file_util| for |mode|.
   base::PlatformFileError SetUp(
       const FileSystemURL& url,
       FileSystemFileUtil** file_util,
       SetUpMode mode);
 
   // Used only for internal assertions.
   // Returns false if there's another inflight pending operation.
   bool SetPendingOperationType(OperationType type);
@@ skipping 32 matching lines @@
   // LocalFileSystemOperation instance is usually deleted upon completion but
   // could be deleted while it has inflight callbacks when Cancel is called.
   base::WeakPtrFactory<LocalFileSystemOperation> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalFileSystemOperation);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_LOCAL_FILE_SYSTEM_OPERATION_H_