This will allow incoming NV12 frames to be encodable by libvpx without requiring a conversion to I420 before encoding. NV12 is supported in libvpx https://chromium.googlesource.com/webm/libvpx/+/master/CHANGELOG Bug: webrtc:11916 Change-Id: I30e9c42c0607bee07691930c0248921bba09134c Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/183720 Reviewed-by: Niels Moller <nisse@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Commit-Queue: Evan Shrubsole <eshr@google.com> Cr-Commit-Position: refs/heads/master@{#32061}