https://bugs.webkit.org/show_bug.cgi?id=83979

Reviewed by Nikolas Zimmermann.

.: 

This test will crash upon load in Chromium, unless the associated fix is in.

* ManualTests/bugzilla-83979.svg: Added.

Source/WebCore: 

According to the SVG spec, there are numerous restrictions on the
content of nodes (that is, their children). Specific to this problem,
SVGFilter elements may only contain SVGFilterPrimitive elements, and
those may only contain animation related elements. This patch enforces
the restriction on filters in the render tree, thus preventing us from
having (for instance) content that is inside a filter yet filtered by
the filter.

Manual test: ManualTests/bugzilla-83979.svg

* svg/SVGFilterElement.cpp:
(WebCore::SVGFilterElement::childShouldCreateRenderer): Added to only allow renderers for fe* children
(WebCore):
* svg/SVGFilterElement.h:
(SVGFilterElement):
* svg/SVGFilterPrimitiveStandardAttributes.h: Do not allow any children at all for fe* elements.
(SVGFilterPrimitiveStandardAttributes):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@116647 268f45cc-cd09-0410-ab3c-d52691b4dbfc