Annotate third party imports upstream

This is a more durable (for skcms) version of:
    https://skia-review.googlesource.com/c/skia/+/765256

Bug: b/237076898
Change-Id: I67808a0a03b9d37b5e412877e9e6562984bfd65d
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/771176
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
2 files changed