[13]: RFR: 8174268: Declare a public field in JapaneseEra for the era starting May 2019

[naoto.sato at oracle.com]

Hello,

Please review the fix to the following issue:

https://bugs.openjdk.java.net/browse/JDK-8174268

The CSR and the proposed changeset are located at:

https://bugs.openjdk.java.net/browse/JDK-8193826
http://cr.openjdk.java.net/~naoto/8174268/webrev.02/

This is the other part of change of the Japanese new era support, which 
is to declare a public era instance.

Naoto