andrewlewis 845d250442 Restore renderer.isEnded check when updating the playback position.
If rendererMediaClock is non-null, the rendererMediaClockSource is enabled or
started, so remove the check in updatePositionUs.

When disabling renderers for track selection, renderers with changing track
selections always transition from started -> enabled.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=120819483
2016-06-15 19:39:35 +01:00
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