hoangtc e619079a0d Let EventMessage encloses its presentationTimeMs.
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.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=176502938
2017-11-22 18:16:58 +00:00
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