https://bugs.webkit.org/show_bug.cgi?id=34183

Reviewed by Beth Dakin.

WebCore: 

Test: fast/lists/anonymous-items.html

enclosingList() and previousListItem() were DOM-based, but in order to work with anonymous
list items, they need to work with rthe render tree.

* rendering/RenderListItem.cpp:
(WebCore::isList): Factored out.
(WebCore::enclosingList): Added this variant that takes a RenderObject.
(WebCore::previousListItem): Changed to travers the render tree.
(WebCore::RenderListItem::calcValue): Use the RenderObject version of enclosingList()
(WebCore::RenderListItem::setExplicitValue): Added an assertion.
(WebCore::RenderListItem::clearExplicitValue): Ditto.

LayoutTests: 

* fast/lists/anonymous-items.html: Added.
* platform/mac/fast/lists/anonymous-items-expected.checksum: Added.
* platform/mac/fast/lists/anonymous-items-expected.png: Added.
* platform/mac/fast/lists/anonymous-items-expected.txt: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@53868 268f45cc-cd09-0410-ab3c-d52691b4dbfc