Ensure SkCodec headers are accounted for in GN.

We were not using all of our Bazel filegroups when generating GNIs.

Change-Id: Ic2e2ac3d2937a78ca06a52a4fae9358519b08f42
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/770696
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
3 files changed