Add a parameter to FileStreamWriter::CreateForLocalFile to allow creating new

webkit/browser/fileapi/file_stream_writer.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_BROWSER_FILEAPI_FILE_STREAM_WRITER_H_
 #define WEBKIT_BROWSER_FILEAPI_FILE_STREAM_WRITER_H_
 
 #include "base/basictypes.h"
 #include "net/base/completion_callback.h"
 #include "webkit/browser/webkit_storage_browser_export.h"
 
 namespace base {
 class FilePath;
 class TaskRunner;
 }
 
 namespace net {
 class IOBuffer;
 }
 
 namespace fileapi {
 
 // A generic interface for writing to a file-like object.
 class FileStreamWriter {
  public:
+  enum OpenOrCreate { OPEN_EXISTING_FILE, CREATE_NEW_FILE };
+
   // Creates a writer for the existing file in the path |file_path| starting
   // from |initial_offset|. Uses |task_runner| for async file operations.
   WEBKIT_STORAGE_BROWSER_EXPORT static FileStreamWriter* CreateForLocalFile(
       base::TaskRunner* task_runner,
       const base::FilePath& file_path,
-      int64 initial_offset);
+      int64 initial_offset,
+      OpenOrCreate open_or_create);
 
   // Closes the file. If there's an in-flight operation, it is canceled (i.e.,
   // the callback function associated with the operation is not called).
   virtual ~FileStreamWriter() {}
 
   // Writes to the current cursor position asynchronously.
   //
   // Up to buf_len bytes will be written.  (In other words, partial
   // writes are allowed.) If the write completed synchronously, it returns
   // the number of bytes written. If the operation could not be performed, it
@@ skipping 33 matching lines @@
   // is returned, and the callback will be run on the thread where Flush() was
   // called when the flush has completed.
   //
   // It is invalid to call Flush while there is an in-flight async operation.
   virtual int Flush(const net::CompletionCallback& callback) = 0;
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_BROWSER_FILEAPI_FILE_STREAM_WRITER_H_