Proposed API for JEP 259: Stack-Walking API

[Mandy Chung]

> On Oct 30, 2015, at 1:26 PM, Remi Forax <forax at univ-mlv.fr> wrote:
> 
> In StackWalker.Option,
> i think that CLASS_REFERENCE can be renamed to KEEP_CLASS_REFERENCE, maybe ?

What about RETAIN_CLASS_REFERENCE?

I have updated the javadoc in place:
  http://cr.openjdk.java.net/~mchung/jdk9/jep259/api/java/lang/StackWalker.html

Changes include:
- CLASS_REFERENCE renamed to RETAIN_CLASS_REFERENCE
- remove StackWalker.WalkerOption interface
- the batchSizeMapper argument is of IntUnaryOperator type.

Thanks for the feedback, Remi and David.
Mandy