Update PPAPI IDL generator to define versioned structs, and unversioned typedef.

ppapi/thunk/ppb_directory_reader_thunk.cc

 // 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.
 
 #include "ppapi/c/dev/ppb_directory_reader_dev.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/thunk/common.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/thunk.h"
@@ skipping 28 matching lines @@
 }
 
 const PPB_DirectoryReader_Dev g_ppb_directory_reader_thunk = {
   &Create,
   &IsDirectoryReader,
   &GetNextEntry
 };
 
 }  // namespace
 
-const PPB_DirectoryReader_Dev* GetPPB_DirectoryReader_Dev_Thunk() {
+const PPB_DirectoryReader_Dev_0_5* GetPPB_DirectoryReader_Dev_0_5_Thunk() {
   return &g_ppb_directory_reader_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi