https://bugs.webkit.org/show_bug.cgi?id=120461

Reviewed by Andreas Kling.

Move NodeRenderingContext::createRendererIfNeeded() and the related utility functions to StyleResolveTree.
        
Tighten typing and constness. Refactor sligthly to be more understandable.

* dom/Element.cpp:
(WebCore::Element::shouldMoveToFlowThread):
* dom/Element.h:
* dom/NodeRenderingContext.cpp:
(WebCore::NodeRenderingContext::NodeRenderingContext):
(WebCore::NodeRenderingContext::nextRenderer):
(WebCore::NodeRenderingContext::previousRenderer):
(WebCore::NodeRenderingContext::parentRenderer):
* dom/NodeRenderingContext.h:
* dom/PseudoElement.h:
* style/StyleResolveTree.cpp:
(WebCore::Style::nextSiblingRenderer):
(WebCore::Style::shouldCreateRenderer):
(WebCore::Style::elementInsideRegionNeedsRenderer):
(WebCore::Style::moveToFlowThreadIfNeeded):
(WebCore::Style::createRendererIfNeeded):
(WebCore::Style::attachRenderTree):
* svg/SVGElement.cpp:
(WebCore::SVGElement::shouldMoveToFlowThread):
* svg/SVGElement.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154806 268f45cc-cd09-0410-ab3c-d52691b4dbfc