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

ppapi/c/dev/ppb_scrollbar_dev.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.
  */
 
-/* From dev/ppb_scrollbar_dev.idl modified Tue Oct  4 08:53:30 2011. */
+/* From dev/ppb_scrollbar_dev.idl modified Wed Oct  5 14:06:02 2011. */
 
 #ifndef PPAPI_C_DEV_PPB_SCROLLBAR_DEV_H_
 #define PPAPI_C_DEV_PPB_SCROLLBAR_DEV_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_point.h"
 #include "ppapi/c/pp_rect.h"
 #include "ppapi/c/pp_resource.h"
@@ skipping 25 matching lines @@
  */
 
 /**
  * @addtogroup Interfaces
  * @{
  */
 /**
  * The interface for a scrollbar.  A scrollbar is a widget, so the functions
  * in PPB_Widget can also be used with scrollbar objects.
  */
-struct PPB_Scrollbar_Dev {
+struct PPB_Scrollbar_Dev_0_5 {
   /**
    * Create a new scrollbar.  Returns 0 if the instance is invalid.
    */
   PP_Resource (*Create)(PP_Instance instance, PP_Bool vertical);
   /**
    * Returns PP_TRUE if the given resource is a Scrollbar. Returns PP_FALSE if
    * the resource is invalid or some type other than a scrollbar.
    */
   PP_Bool (*IsScrollbar)(PP_Resource resource);
   /**
@@ skipping 26 matching lines @@
                        uint32_t count);
   /**
    * Scroll by "multiplier" pixels/lines/pages units.  Positive values are
    * forward and negative are backward.  If "unit" is document then any positive
    * value goes to the end while any negative value goes to the beginning.
    */
   void (*ScrollBy)(PP_Resource scrollbar,
                    PP_ScrollBy_Dev unit,
                    int32_t multiplier);
 };
+
+typedef struct PPB_Scrollbar_Dev_0_5 PPB_Scrollbar_Dev;
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_DEV_PPB_SCROLLBAR_DEV_H_ */