RFR: 8184205 : Captions on tabbed tables are squashed together

[Priya Lakshmi Muthuswamy]

Hi,

Kindly review the fix for https://bugs.openjdk.java.net/browse/JDK-8184205
Introduce some more aria controls and also introduced keyboard 
navigation within tabs.
User can navigate between the tabs using arrow keys and the tabs will be 
automatically activated on focus.

webrev: http://cr.openjdk.java.net/~pmuthuswamy/8184205/webrev.02/
api: http://cr.openjdk.java.net/~pmuthuswamy/8184205/api/

Thanks,
Priya