This functionality is needed when sending C++ I420 buffers to Java VideoSinks or Java encoders. Bug: webrtc:7749 Change-Id: Ied783470b90b9d2e0cb5930795f35de4a296d499 Reviewed-on: https://chromium-review.googlesource.com/532961 Commit-Queue: Magnus Jedvert <magjed@webrtc.org> Reviewed-by: Sami Kalliomäki <sakal@webrtc.org> Cr-Commit-Position: refs/heads/master@{#18597}