https://bugs.webkit.org/show_bug.cgi?id=80134

Reviewed by David Hyatt.

Source/WebCore:

The named flow content nodes collection contains those nodes with webkitFlowInto property set to 'flow'.
In the list, the nodes are placed in document order. Nodes with display:none are also part of the list.
The list of nodes is returned as a static node list.

The content nodes are stored in RenderNamedFlowThread. The content nodes are added to the list in NodeRenderingContext::moveToFlowThreadIfNeeded
and removed from the list in Element::detach. When an element -webkit-flow-into property is changed, the element is detached and attached.
I have also added a bit in NodeFlags to mark that an element is part of a named flow (and the corresponding inNamedFlow/setInNamedFlow/clearInNamedFlow functions).

Test: fast/regions/webkit-named-flow-content-nodes.html

* dom/Document.cpp:
(WebCore::Document::webkitGetFlowByName):
* dom/Document.h:
* dom/Element.cpp:
(WebCore::Element::detach):
* dom/Node.h:
(WebCore::Node::inNamedFlow):
(WebCore::Node::setInNamedFlow):
(WebCore::Node::clearInNamedFlow):
(Node):
* dom/NodeRenderingContext.cpp:
(WebCore::NodeRenderingContext::moveToFlowThreadIfNeeded):
* dom/WebKitNamedFlow.cpp:
(WebCore::WebKitNamedFlow::contentNodes):
(WebCore):
* dom/WebKitNamedFlow.h:
(WebKitNamedFlow):
* dom/WebKitNamedFlow.idl:
* rendering/FlowThreadController.cpp:
(WebCore::FlowThreadController::registerNamedFlowContentNode):
(WebCore):
(WebCore::FlowThreadController::unregisterNamedFlowContentNode):
* rendering/FlowThreadController.h:
(FlowThreadController):
* rendering/RenderNamedFlowThread.cpp:
(WebCore):
(WebCore::RenderNamedFlowThread::registerNamedFlowContentNode):
(WebCore::RenderNamedFlowThread::unregisterNamedFlowContentNode):
* rendering/RenderNamedFlowThread.h:
(WebCore):
(RenderNamedFlowThread):
(WebCore::RenderNamedFlowThread::contentNodes):
(WebCore::RenderNamedFlowThread::hasContentNode):

LayoutTests:

* fast/regions/webkit-named-flow-content-nodes-expected.txt: Added.
* fast/regions/webkit-named-flow-content-nodes.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114189 268f45cc-cd09-0410-ab3c-d52691b4dbfc