6c0d676050
This adds callbacks for creating, releasing, and starting to read from media periods. Such events allow listeners to keep a list of active media periods. This is useful to determine when no further events for a certain media period are expected. It also allows listeners to associate renderer events unambigiously with a reading media period. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=190462717