Add new DDL helper files to public.bzl

Change-Id: I9243b5ed143ff7e688cd26fb8649676286a65794
Reviewed-on: https://skia-review.googlesource.com/130780
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed