Chrome and other platforms will need access to this class when sending
biplanar buffers to webrtc.
Bug: chromium:1134165
Change-Id: Ia787ab02cb9f302670d6a81e8d4963e7d8fca468
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/187181
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Evan Shrubsole <eshr@google.com>
Cr-Commit-Position: refs/heads/master@{#32348}