575a8024bc3a2591c2090c3a424aae10db306577

Plus fixing incorrect mirror matrix for 90 and 270 degree rotations. BUG=4398 R=wzh@webrtc.org Review URL: https://webrtc-codereview.appspot.com/50689004 Cr-Commit-Position: refs/heads/master@{#8993}
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