public.bzl: add metal_objc_srcs()

Change-Id: I0e2f7a029a5e4a9dc6901eaab1791e8b74ebe29b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/259338
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
1 file changed