[ssci] Add Shipped field to READMEs

This CL adds the Shipped field and updates the
License File field in Chromium READMEs within the
directory /third_party/libpng.

See the LSC doc at go/lsc-chrome-metadata.

This CL was uploaded by git cl split.

R=scroggo@google.com

Bug: b:285450740
Change-Id: I95a7570bd2fb5135af658465ede66766af2d15be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4663985
Commit-Queue: Anne Redulla <aredulla@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Cr-Commit-Position: refs/heads/main@{#1170178}
NOKEYCHECK=True
GitOrigin-RevId: 9875ece6f6b410989ab7d77a48ece4095565f391
1 file changed