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

ppapi/c/dev/ppb_buffer_dev.h

Index: ppapi/c/dev/ppb_buffer_dev.h
diff --git a/ppapi/c/dev/ppb_buffer_dev.h b/ppapi/c/dev/ppb_buffer_dev.h
index 785fc3abb36025953d2be2c479cba5fddaba1989..bbe353d41c6290a7f70bf11db9d15d6c8206a63b 100644
--- a/ppapi/c/dev/ppb_buffer_dev.h
+++ b/ppapi/c/dev/ppb_buffer_dev.h
@@ -3,7 +3,7 @@
  * found in the LICENSE file.
  */
 
-/* From dev/ppb_buffer_dev.idl modified Fri Aug 26 13:58:06 2011. */
+/* From dev/ppb_buffer_dev.idl modified Wed Oct  5 14:06:02 2011. */
 
 #ifndef PPAPI_C_DEV_PPB_BUFFER_DEV_H_
 #define PPAPI_C_DEV_PPB_BUFFER_DEV_H_
@@ -27,7 +27,7 @@
  * @addtogroup Interfaces
  * @{
  */
-struct PPB_Buffer_Dev {
+struct PPB_Buffer_Dev_0_4 {
   /**
    * Allocates a buffer of the given size in bytes. The return value will have
    * a non-zero ID on success, or zero on failure. Failure means the module
@@ -54,6 +54,8 @@ struct PPB_Buffer_Dev {
    */
   void (*Unmap)(PP_Resource resource);
 };
+
+typedef struct PPB_Buffer_Dev_0_4 PPB_Buffer_Dev;
 /**
  * @}
  */