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

ppapi/c/dev/ppb_video_layer_dev.h

Index: ppapi/c/dev/ppb_video_layer_dev.h
diff --git a/ppapi/c/dev/ppb_video_layer_dev.h b/ppapi/c/dev/ppb_video_layer_dev.h
index b78ea7eec049a0e60e8f7dec984465c19de69cd7..53dafc10b5a4cd0e0cb4c70b457c50565ba6d16a 100644
--- a/ppapi/c/dev/ppb_video_layer_dev.h
+++ b/ppapi/c/dev/ppb_video_layer_dev.h
@@ -3,7 +3,7 @@
  * found in the LICENSE file.
  */
 
-/* From dev/ppb_video_layer_dev.idl modified Tue Nov 29 11:43:36 2011. */
+/* From dev/ppb_video_layer_dev.idl modified Wed Dec 14 18:08:00 2011. */
 
 #ifndef PPAPI_C_DEV_PPB_VIDEO_LAYER_DEV_H_
 #define PPAPI_C_DEV_PPB_VIDEO_LAYER_DEV_H_
@@ -83,7 +83,7 @@ PP_COMPILE_ASSERT_SIZE_IN_BYTES(PP_VideoLayerMode_Dev, 4);
  * In this mode the content of the video layer is updated by a hardware video
  * decoder.
  */
-struct PPB_VideoLayer_Dev {
+struct PPB_VideoLayer_Dev_0_1 {
   /**
    * Creates a video layer.
    */
@@ -153,6 +153,8 @@ struct PPB_VideoLayer_Dev {
                            uint32_t no_of_planes,
                            const void* planes[]);
 };
+
+typedef struct PPB_VideoLayer_Dev_0_1 PPB_VideoLayer_Dev;
 /**
  * @}
  */