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

Source/core/rendering/svg/RenderSVGResourceFilterPrimitive.cpp

Index: Source/core/rendering/svg/RenderSVGResourceFilterPrimitive.cpp
diff --git a/Source/core/rendering/svg/RenderSVGResourceFilterPrimitive.cpp b/Source/core/rendering/svg/RenderSVGResourceFilterPrimitive.cpp
index 7f985b2ff5b027919e66bd50ab570d39a48cb7dc..2d3824230800011d7fbe5a046978855168526694 100644
--- a/Source/core/rendering/svg/RenderSVGResourceFilterPrimitive.cpp
+++ b/Source/core/rendering/svg/RenderSVGResourceFilterPrimitive.cpp
@@ -74,11 +74,11 @@ FloatRect RenderSVGResourceFilterPrimitive::determineFilterPrimitiveSubregion(Fi
         for (unsigned i = 1; i < numberOfInputEffects; ++i)
             subregion.unite(determineFilterPrimitiveSubregion(effect->inputEffect(i)));
     } else
-        subregion = filter->filterRegionInUserSpace();
+        subregion = filter->filterRegion();
 
     // After calling determineFilterPrimitiveSubregion on the target effect, reset the subregion again for <feTile>.
     if (effect->filterEffectType() == FilterEffectTypeTile)
-        subregion = filter->filterRegionInUserSpace();
+        subregion = filter->filterRegion();
 
     FloatRect effectBoundaries = effect->effectBoundaries();
     if (effect->hasX())
@@ -97,7 +97,7 @@ FloatRect RenderSVGResourceFilterPrimitive::determineFilterPrimitiveSubregion(Fi
     absoluteSubregion.scale(filterResolution.width(), filterResolution.height());
 
     // Clip every filter effect to the filter region.
-    FloatRect absoluteScaledFilterRegion = filter->filterRegion();
+    FloatRect absoluteScaledFilterRegion = filter->absoluteFilterRegion();
     absoluteScaledFilterRegion.scale(filterResolution.width(), filterResolution.height());
     absoluteSubregion.intersect(absoluteScaledFilterRegion);