PPAPI: Add new PPB_FileRef.MakeDirectory to support exclusive operation

ppapi/tests/test_file_ref.h

 // Copyright (c) 2011 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 PAPPI_TESTS_TEST_FILE_REF_H_
 #define PAPPI_TESTS_TEST_FILE_REF_H_
 
 #include <string>
 
 #include "ppapi/tests/test_case.h"
@@ skipping 16 matching lines @@
   std::string MakeExternalFileRef(pp::FileRef* file_ref_ext);
 
   int32_t DeleteDirectoryRecursively(pp::FileRef* dir);
 
   std::string TestCreate();
   std::string TestGetFileSystemType();
   std::string TestGetName();
   std::string TestGetPath();
   std::string TestGetParent();
   std::string TestMakeDirectory();
+  std::string TestMakeDirectoryExclusive();
   std::string TestQueryAndTouchFile();
   std::string TestDeleteFileAndDirectory();
   std::string TestRenameFileAndDirectory();
   std::string TestQuery();
   std::string TestFileNameEscaping();
   std::string TestReadDirectoryEntries();
 };
 
 #endif  // PAPPI_TESTS_TEST_FILE_REF_H_