The conversion code was wrong because it assumed the 3x3 matrix is a XYZ-matrix when it really is XYW-matrix. We have to override the matrix for I420 frames to flip the vertically before rendering. R=magjed@webrtc.org Bug: webrtc:7760 Change-Id: I1f08c1a929bf5721706e2a902701100cf7a9c31d Reviewed-on: https://chromium-review.googlesource.com/541346 Reviewed-by: Magnus Jedvert <magjed@webrtc.org> Commit-Queue: Sami Kalliomäki <sakal@webrtc.org> Cr-Commit-Position: refs/heads/master@{#18801}