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

ppapi/thunk/ppb_audio_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/thunk/thunk.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_audio_api.h"
 #include "ppapi/thunk/resource_creation_api.h"
 
 namespace ppapi {
@@ skipping 43 matching lines @@
 const PPB_Audio g_ppb_audio_thunk = {
   &Create,
   &IsAudio,
   &GetCurrentConfiguration,
   &StartPlayback,
   &StopPlayback
 };
 
 }  // namespace
 
-const PPB_Audio* GetPPB_Audio_Thunk() {
+const PPB_Audio_1_0* GetPPB_Audio_1_0_Thunk() {
   return &g_ppb_audio_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi