
- This is needed to make DefaultTrackSelector properly thread safe, and enable atomic changes to the selector that, for example, disable a renderer and enable another one at the same time. - This change also saves/restores parameters and the start position in PlayerActivity, resolving the ref'd issue. Issue: #3915 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=193913350