https://bugs.webkit.org/show_bug.cgi?id=83317

Reviewed by Simon Fraser.

Source/WebCore:

An extremely large element causes problems with filters, either by
taking too long to compute the output or using too much memory. The
filter engine already has some constants for maximum expected size.
Make sure the render tree checks them before deciding to apply
effects.

Tests: css3/filters/huge-region-composited.html
       css3/filters/huge-region.html

* platform/graphics/filters/FilterEffect.cpp:
(WebCore::FilterEffect::apply):
* rendering/FilterEffectRenderer.cpp:
(WebCore):
(WebCore::isFilterSizeValid):
(WebCore::FilterEffectRenderer::build):
(WebCore::FilterEffectRenderer::updateBackingStore):
(WebCore::FilterEffectRendererHelper::beginFilterEffect):
* rendering/FilterEffectRenderer.h:
(FilterEffectRenderer):
* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::updateOrRemoveFilterEffect):

LayoutTests:

* css3/filters/huge-region-composited-expected.txt: Added.
* css3/filters/huge-region-composited.html: Added.
* css3/filters/huge-region-expected.txt: Added.
* css3/filters/huge-region.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114172 268f45cc-cd09-0410-ab3c-d52691b4dbfc