all DM to see src/core

BUG=skia:

Change-Id: I6c405596799b99fb1a3afbe097995ecc7fbc3d97
Reviewed-on: https://skia-review.googlesource.com/8697
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/public.bzl b/public.bzl
index cf4a56b..d0a9cb2 100644
--- a/public.bzl
+++ b/public.bzl
@@ -481,6 +481,7 @@
     "dm",
     "gm",
     "src/codec",
+    "src/core",
     "src/effects",
     "src/effects/gradients",
     "src/fonts",