Implement filter primitive subregion for reference CSS filters. This required refactoring determin…

Source/core/rendering/svg/RenderSVGResourceFilter.cpp

Index: Source/core/rendering/svg/RenderSVGResourceFilter.cpp
diff --git a/Source/core/rendering/svg/RenderSVGResourceFilter.cpp b/Source/core/rendering/svg/RenderSVGResourceFilter.cpp
index 14515ec9c1a003b0dabd1056676c25871e0ff888..d9ca81b2ddcc2a0545668738cad9048f0b9b85ae 100644
--- a/Source/core/rendering/svg/RenderSVGResourceFilter.cpp
+++ b/Source/core/rendering/svg/RenderSVGResourceFilter.cpp
@@ -211,13 +211,13 @@ bool RenderSVGResourceFilter::applyResource(RenderObject* object, RenderStyle*,
     if (!lastEffect)
         return false;
 
-    RenderSVGResourceFilterPrimitive::determineFilterPrimitiveSubregion(lastEffect);
+    lastEffect->determineFilterPrimitiveSubregion();
     FloatRect subRegion = lastEffect->maxEffectRect();
     // At least one FilterEffect has a too big image size,
     // recalculate the effect sizes with new scale factors.
     if (!fitsInMaximumImageSize(subRegion.size(), scale)) {
         filterData->filter->setFilterResolution(scale);
-        RenderSVGResourceFilterPrimitive::determineFilterPrimitiveSubregion(lastEffect);
+        lastEffect->determineFilterPrimitiveSubregion();
     }
 
     // If the drawingRegion is empty, we have something like <g filter=".."/>.