Conclusion:
1. set NSPR_LOG_MODULES=MediaDecoder:5 to show VERBOSE_LOG logs.
2. set NSPR_LOG_MODULES=MediaSample:4 to show SAMPLE_LOG logs.

Cause:
Accessing env vars in hot spot could be a performance hit. Since VERBOSE_LOG 
and SAMPLE_LOG are per-frame level logs, it would be a problem to read env vars 
so frequently. Per bug 1164297, we want to avoid accessing env vars in hot spot 
to prevent performance hit.

BR,
JW

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