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

ppapi/c/dev/ppb_video_decoder_dev.h

Index: ppapi/c/dev/ppb_video_decoder_dev.h
diff --git a/ppapi/c/dev/ppb_video_decoder_dev.h b/ppapi/c/dev/ppb_video_decoder_dev.h
index 6e16bb3bd9f374ae2aa5dde691a347824e11e5ee..9f14a3590a46adcccbaa5c84109141e29e98d890 100644
--- a/ppapi/c/dev/ppb_video_decoder_dev.h
+++ b/ppapi/c/dev/ppb_video_decoder_dev.h
@@ -3,7 +3,7 @@
  * found in the LICENSE file.
  */
 
-/* From dev/ppb_video_decoder_dev.idl modified Tue Nov 29 11:27:39 2011. */
+/* From dev/ppb_video_decoder_dev.idl modified Wed Dec 14 18:08:00 2011. */
 
 #ifndef PPAPI_C_DEV_PPB_VIDEO_DECODER_DEV_H_
 #define PPAPI_C_DEV_PPB_VIDEO_DECODER_DEV_H_
@@ -49,7 +49,7 @@
  * See PPP_VideoDecoder_Dev for the notifications the decoder may send the
  * plugin.
  */
-struct PPB_VideoDecoder_Dev {
+struct PPB_VideoDecoder_Dev_0_16 {
   /**
    * Creates & initializes a video decoder.
    *
@@ -157,6 +157,8 @@ struct PPB_VideoDecoder_Dev {
    */
   void (*Destroy)(PP_Resource video_decoder);
 };
+
+typedef struct PPB_VideoDecoder_Dev_0_16 PPB_VideoDecoder_Dev;
 /**
  * @}
  */