Apply GREASE to TLS 1.3 tickets.

Change-Id: I5d4fc0d3204744e93d71a36923469035c19a5b10
Reviewed-on: https://boringssl-review.googlesource.com/11560
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
diff --git a/ssl/internal.h b/ssl/internal.h
index 3e7c053..720b822 100644
--- a/ssl/internal.h
+++ b/ssl/internal.h
@@ -1024,6 +1024,7 @@
   ssl_grease_extension1,
   ssl_grease_extension2,
   ssl_grease_version,
+  ssl_grease_ticket_extension,
 };
 
 /* ssl_get_grease_value returns a GREASE value for |ssl|. For a given