RFR (JAXP): 8035467: Xerces Update: Move to Xalan based DOM L3 serializer. Deprecate Xerces' native serializer.

[huizhe wang]

Hi all,

This is part of Xerces update: move to a common serialization codebase 
with Xalan. As noted in one of the mailing list discussions:

Xalan's serializer has the same baseline capability as Xerces' Java serializer, effort was devoted to improve its performance
and fix bugs and it is being maintained by Xalan-J community and so we should use Xalan's serializer as the primary code base moving forward.


The main code changes are a new set of classes in "dom3" added to the 
serializer package.

After fixing a few compatibility issues related to the pretty-print 
feature, the patch now passes all of the JAXP tests.

Bug:
       https://bugs.openjdk.java.net/browse/JDK-8035467

Webrev:
       http://cr.openjdk.java.net/~joehw/jdk9/8035467/webrev/

Please review.

Thanks,
Joe