Spawn from Bug 1418766 comment 11, quote =========== refine the logic about pausing/resuming exoplayer by provide 2 functions, e.g. ShouldPauseExoPlayer(), ShouldResumeExoPlayer(). Then assertion could be added in play()/seek()/resume()/pause()/etc... to ensure that we don't want those methods be called in unexpected states. In that case, we don't need this tricky 'returns' ===========

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