
DefaultAudioSink had a lot of code related to tracking the position of the underlying AudioTrack, and working around issues with the position APIs. Move this code to a separate class responsible for position tracking. This is in preparation for improving the audio timestamp polling behavior. This change is intended not to cause any behavior changes. Issue: #3841 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=189344743