Code Review Request for 6720170: ByteArrayInputStream.skip(long) can overflow internally

[Mandy Chung]

  6720170: ByteArrayInputStream.skip(long) can overflow internally

Webrev at:
    http://cr.openjdk.java.net/~mchung/6720170/webrev.00/

This fixes the read method and the skip method of ByteArrayInputStream 
to be overflow conscious.

Thanks
Mandy