
Currently EventMessage's presentationTimeMs is kept separately in EventSampleStream. However, EventMessage's presentationTimeMs maybe used in other places besides EventSampleStream, such as when handling `emsg' messages targeting the player. This CL let EventMessage object to holds its presentationTimeMs for such use cases. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=176502938