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

ppapi/c/dev/ppb_crypto_dev.h

Index: ppapi/c/dev/ppb_crypto_dev.h
diff --git a/ppapi/c/dev/ppb_crypto_dev.h b/ppapi/c/dev/ppb_crypto_dev.h
index 27ef6ac9452726339867f89513af3680c917cf39..c0b64cacf67ba2740d1f4a9f7908591166210c78 100644
--- a/ppapi/c/dev/ppb_crypto_dev.h
+++ b/ppapi/c/dev/ppb_crypto_dev.h
@@ -11,7 +11,7 @@
 #define PPB_CRYPTO_DEV_INTERFACE_0_1 "PPB_Crypto(Dev);0.1"
 #define PPB_CRYPTO_DEV_INTERFACE PPB_CRYPTO_DEV_INTERFACE_0_1
 
-struct PPB_Crypto_Dev {
+struct PPB_Crypto_Dev_0_1 {
   /**
    * Fills the given buffer with random bytes. This is potentially slow so only
    * request the amount of data you need.
@@ -19,4 +19,6 @@ struct PPB_Crypto_Dev {
   void (*GetRandomBytes)(char* buffer, uint32_t num_bytes);
 };
 
+typedef struct PPB_Crypto_Dev_0_1 PPB_Crypto_Dev;
+
 #endif