RFR JDK-8038310: Re-examine integration of extended Charsets

[Mandy Chung]

On 05/28/2015 08:53 AM, Xueming Shen wrote:
> http://cr.openjdk.java.net/~sherman/8069588_8038310/webrev

This change looks okay.   This code optimizes for space and assumes one 
single installed provider which I am not sure if it buys us much - 
List.toArray might be another alternative rather than 
expanding/shrinking the array.  But just minor point.

Mandy