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The purpose of this visualization CL is to add the ability to record video at the source, after encode, and after decode, in the VideoProcessor tests. These output files can then be replayed and used as a subjective complement to the objective metric plots given by the existing Python plotting script. BUG=webrtc:6634 Review-Url: https://codereview.webrtc.org/2700493006 Cr-Commit-Position: refs/heads/master@{#16738}