Created a blocking copy to temporary file function.

mojo/data_pipe_utils/data_pipe_utils.h

 // Copyright 2014 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 MOJO_DATA_PIPE_UTILS_DATA_PIPE_UTILS_H_
 #define MOJO_DATA_PIPE_UTILS_DATA_PIPE_UTILS_H_
 
 #include <string>
 
 #include "base/callback_forward.h"
@@ skipping 30 matching lines @@
 
 bool BlockingCopyFromString(const std::string& source,
                             const ScopedDataPipeProducerHandle& destination);
 
 // Synchronously copies data from source to the destination file returning true
 // on success and false on error.  In case of an error, |destination| holds the
 // data that could be read from the source before the error occured.
 bool BlockingCopyToFile(ScopedDataPipeConsumerHandle source,
                         const base::FilePath& destination);
 
+// Similar to BlockingCopyToFile, but copies source data to a temporary
+// file which is unlinked immediately so that it is only accessible by
+// file descriptor (and removed once closed or the creating process dies).
+bool BlockingCopyToTempFile(ScopedDataPipeConsumerHandle source,
+                            FILE** fpp);
+
 }  // namespace common
 }  // namespace mojo
 
 #endif  // MOJO_DATA_PIPE_UTILS_DATA_PIPE_UTILS_H_