Reviewed by Geoffrey Garen.

        Tests for: XPathResult should keep its node set's JS wrappers alive
        https://bugs.webkit.org/show_bug.cgi?id=34231

        * fast/xpath/xpath-result-eventlistener-crash-expected.txt: Added.
        * fast/xpath/xpath-result-eventlistener-crash.html: Added.
        Test that an event listener registered on an XPATH result snapshots' node does
        not crash. This case was already fixed prior to this change. However it is better
        to keep it as a regression test.

        * fast/xpath/xpath-snapshot-result-should-mark-its-nodeset-expected.txt: Added.
        * fast/xpath/xpath-snapshot-result-should-mark-its-nodeset.html: Added.
        Test that an XPath snapshot result keeps its node wrapper alive.

        * fast/xpath/xpath-iterator-result-should-mark-its-nodeset-expected.txt: Added.
        * fast/xpath/xpath-iterator-result-should-mark-its-nodeset.html: Added.
        Test that an XPath iterator result keeps its node wrapper alive.

        * fast/xpath/xpath-other-nodeset-result-should-mark-its-nodeset-expected.txt: Added.
        * fast/xpath/xpath-other-nodeset-result-should-mark-its-nodeset.html: Added.
        Test that other XPath result that holds nodes keeps their wrapper alive.
2011-05-11  Julien Chaffraix  <jchaffraix@webkit.org>

        Reviewed by Geoffrey Garen.

        XPathResult should keep its node set's JS wrappers alive
        https://bugs.webkit.org/show_bug.cgi?id=34231

        The change added a custom mark function for JSC. V8 was already properly
        marking the nodes so no change were done on the V8 side.

        Tests: fast/xpath/xpath-iterator-result-should-mark-its-nodeset.html
               fast/xpath/xpath-other-nodeset-result-should-mark-its-nodeset.html
               fast/xpath/xpath-result-eventlistener-crash.html
               fast/xpath/xpath-snapshot-result-should-mark-its-nodeset.html

        * Android.jscbindings.mk:
        * GNUmakefile.list.am:
        * UseJSC.cmake:
        * WebCore.gypi:
        * WebCore.pro:
        * WebCore.vcproj/WebCore.vcproj:
        * WebCore.xcodeproj/project.pbxproj:
        * bindings/js/JSBindingsAllInOne.cpp:
        Added the new file to our build systems.

        * bindings/js/JSXPathResultCustom.cpp: Added.
        (WebCore::JSXPathResult::markChildren): Added code to mark the
        XPathResult snapshot's nodes.
        * xml/XPathResult.h:
        (WebCore::XPathResult::value): Exposed this getter so that we can
        mark our XPathValue.
        * xml/XPathResult.idl: Told the IDL parser that we now need
        a custom mark function.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@86234 268f45cc-cd09-0410-ab3c-d52691b4dbfc