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

ppapi/thunk/ppb_image_data_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/pp_errors.h"
 #include "ppapi/c/ppb_image_data.h"
 #include "ppapi/shared_impl/ppb_image_data_shared.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_image_data_api.h"
 #include "ppapi/thunk/resource_creation_api.h"
@@ skipping 58 matching lines @@
   &IsImageDataFormatSupported,
   &Create,
   &IsImageData,
   &Describe,
   &Map,
   &Unmap,
 };
 
 }  // namespace
 
-const PPB_ImageData* GetPPB_ImageData_Thunk() {
+const PPB_ImageData_1_0* GetPPB_ImageData_1_0_Thunk() {
   return &g_ppb_image_data_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi