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

ppapi/thunk/ppb_layer_compositor_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/dev/ppb_layer_compositor_dev.h"
 #include "ppapi/thunk/common.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/thunk.h"
 #include "ppapi/thunk/ppb_layer_compositor_api.h"
@@ skipping 45 matching lines @@
   &RemoveLayer,
   &SetZIndex,
   &SetRect,
   &SetDisplay,
   &MarkAsDirty,
   &SwapBuffers,
 };
 
 }  // namespace
 
-const PPB_LayerCompositor_Dev* GetPPB_LayerCompositor_Dev_Thunk() {
+const PPB_LayerCompositor_Dev_0_2* GetPPB_LayerCompositor_Dev_0_2_Thunk() {
   return &g_ppb_layer_compositor_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi