RFR:JDK-8141452:Convert between TimeUnit and ChronoUnit

[nadeesh tv]

Hi all,

Please review a fix for conversion between Chronounit and Timeunit

Bug ID : https://bugs.openjdk.java.net/browse/JDK-8141452

webrev: http://cr.openjdk.java.net/~ntv/8141452/webrev.00/

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Thanks and Regards,
Nadeesh TV