Add SkColorData.h to gn.

Allows IDEs to find it, brings us a bit closer to getting gn check to
work.

Change-Id: I1e0c8d01f272c41c97dbbf40402b64f44a6c3c48
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/249421
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed