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Some members are accessed from the video processing thread for the VoEVideoSync interface, and thus need to be protected. This is a problem that TSan sometimes reports. Also moved UpdatePlayoutTimestamp to private section since it's only needed internally. And renamed least_required_delay_ms to LeastRequiredDelayMs, since it no longer just returns a cached value. BUG=webrtc:4663 Review URL: https://codereview.webrtc.org/1263223002 Cr-Commit-Position: refs/heads/master@{#9706}