split up skia_srcs() in public.bzl

This will let us smoothly switch over from using skia_srcs()
to using base_srcs() and gl_srcs(), listing things we need
from src/ports (and src/utils/mac/*.cpp) in BUILD instead.

Change-Id: I85dabd0dd620e1dcbcf4883ea8cfba3c111ce319
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/204126
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed