tonihei c8f39fe14d Update ExoPlayer doc to specifically discourage parallel access instead of allowing it.
Even if a developer synchronizes every method, thread safety is still not guaranteed
because the internal callback methods can't be synced from outside.

Issue:#3773

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=184122072
2018-02-01 15:30:00 +00:00
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