[7u] Request for approval: 6877495 JTextField and JTextArea does not support supplementary characters

[mikhail cherkasov]

Hello All,

This is a back port from jdk 8 to jdk 7u.

Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6877495
Please find webrev there: 
http://cr.openjdk.java.net/~mcherkas/6877495/webrev.00/ 
<http://cr.openjdk.java.net/%7Emcherkas/6877495/webrev.00/>
jdk8 changeset: http://hg.openjdk.java.net/jdk8/awt/jdk/rev/91e17a813483
Code 
review:http://mail.openjdk.java.net/pipermail/swing-dev/2013-February/002588.html
Reviewers:  serb, alexp