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

webkit/plugins/ppapi/ppp_pdf.h

Index: webkit/plugins/ppapi/ppp_pdf.h
diff --git a/webkit/plugins/ppapi/ppp_pdf.h b/webkit/plugins/ppapi/ppp_pdf.h
index 64052252010344833103ac3a026d731b0f215769..d19d254ae1efba6151c97a9691e62d4bd1c166f0 100644
--- a/webkit/plugins/ppapi/ppp_pdf.h
+++ b/webkit/plugins/ppapi/ppp_pdf.h
@@ -9,12 +9,14 @@
 #include "ppapi/c/pp_point.h"
 #include "ppapi/c/pp_var.h"
 
-#define PPP_PDF_INTERFACE "PPP_Pdf;1"
+#define PPP_PDF_INTERFACE_1 "PPP_Pdf;1"
 
-struct PPP_Pdf {
+struct PPP_Pdf_1 {
   // Returns an absolute URL if the position is over a link.
   PP_Var (*GetLinkAtPosition)(PP_Instance instance,
                               PP_Point point);
 };
 
+typedef PPP_Pdf_1 PPP_Pdf;
+
 #endif  // WEBKIT_PLUGINS_PPAPI_PPP_PDF_H_