https://bugs.webkit.org/show_bug.cgi?id=99694

Reviewed by Eric Seidel.

Our SVG pending resource tracking is used for handling dynamic id changes. For example,
if an SVG element references an id that is not yet in the document (or has been removed),
the SVG element will be 'pending' an id. When styled elements are inserted into
the document, buildPendingResourcesIfNeeded() is called to force any pending elements
to resolve their dependencies. Only SVGStyledElement targets can be referenced using
this infrastructure, and that is not changed with this patch.

Previously, only SVGStyledElements could have pending resources. Some examples of where
this is violated are SVGAnimateElement and SVGMPathElement which are not a styled elements
but which can have pending references (they can reference styled elements and
paths, respectively). This patch changes the pending resource handling to allow
any SVGElement to have pending resources.

This patch is only a refactoring of code in preparation for WK99694 and does not
affect existing functionality or tests.

* svg/SVGDocumentExtensions.cpp:
(WebCore::SVGDocumentExtensions::addPendingResource):
(WebCore::SVGDocumentExtensions::isElementPendingResources):
(WebCore::SVGDocumentExtensions::isElementPendingResource):
(WebCore::SVGDocumentExtensions::removeElementFromPendingResources):
(WebCore::SVGDocumentExtensions::removeElementFromPendingResourcesForRemoval):
* svg/SVGDocumentExtensions.h:
(WebCore):
(SVGDocumentExtensions):
* svg/SVGElement.cpp:
(WebCore::SVGElement::~SVGElement):
(WebCore::SVGElement::removedFrom):
(WebCore::SVGElement::hasPendingResources):
(WebCore):
(WebCore::SVGElement::setHasPendingResources):
(WebCore::SVGElement::clearHasPendingResourcesIfPossible):
* svg/SVGElement.h:
(SVGElement):
(WebCore::SVGElement::buildPendingResource):
* svg/SVGStyledElement.cpp:
(WebCore):
(WebCore::SVGStyledElement::buildPendingResourcesIfNeeded):
(WebCore::SVGStyledElement::removedFrom):
* svg/SVGStyledElement.h:
(SVGStyledElement):
(WebCore::SVGStyledElement::selfHasRelativeLengths):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@132847 268f45cc-cd09-0410-ab3c-d52691b4dbfc