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This is a reland of 4ea50c2b421ae3e40d1d02b8eb8c5802288b181e Original change's description: > Add unit tests for RTCCVPixelBuffer and ObjCVideoTrackSource. > > This CL also fixes a couple of bugs found in the toI420 method for > RTCCVPixelBuffers backed by RGB CVPixelBuffers. > > Bug: webrtc:9007 > Change-Id: I19ab8177f4b124a503cfda9f0166bd960f668982 > Reviewed-on: https://webrtc-review.googlesource.com/64940 > Commit-Queue: Anders Carlsson <andersc@webrtc.org> > Reviewed-by: Kári Helgason <kthelgason@webrtc.org> > Cr-Commit-Position: refs/heads/master@{#22656} Bug: webrtc:9007 Change-Id: I2a787c64f8d23ffc4ef2419fc258d965f8a9480b Reviewed-on: https://webrtc-review.googlesource.com/66341 Reviewed-by: Kári Helgason <kthelgason@webrtc.org> Commit-Queue: Anders Carlsson <andersc@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22706}