Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGFEDisplacementMapElement.cpp

Index: Source/core/svg/SVGFEDisplacementMapElement.cpp
diff --git a/Source/core/svg/SVGFEDisplacementMapElement.cpp b/Source/core/svg/SVGFEDisplacementMapElement.cpp
index b1f8f3ce34f3049a1bcbf54d79733a00a3035855..9b02fd4adbca44ac39f4b74e4dd56f10a0c65294 100644
--- a/Source/core/svg/SVGFEDisplacementMapElement.cpp
+++ b/Source/core/svg/SVGFEDisplacementMapElement.cpp
@@ -54,6 +54,16 @@ inline SVGFEDisplacementMapElement::SVGFEDisplacementMapElement(Document& docume
     addToPropertyMap(m_yChannelSelector);
 }
 
+void SVGFEDisplacementMapElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_scale);
+    visitor->trace(m_in1);
+    visitor->trace(m_in2);
+    visitor->trace(m_xChannelSelector);
+    visitor->trace(m_yChannelSelector);
+    SVGFilterPrimitiveStandardAttributes::trace(visitor);
+}
+
 DEFINE_NODE_FACTORY(SVGFEDisplacementMapElement)
 
 bool SVGFEDisplacementMapElement::isSupportedAttribute(const QualifiedName& attrName)
@@ -110,7 +120,7 @@ void SVGFEDisplacementMapElement::svgAttributeChanged(const QualifiedName& attrN
     ASSERT_NOT_REACHED();
 }
 
-PassRefPtr<FilterEffect> SVGFEDisplacementMapElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
+PassRefPtrWillBeRawPtr<FilterEffect> SVGFEDisplacementMapElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
 {
     FilterEffect* input1 = filterBuilder->getEffectById(AtomicString(m_in1->currentValue()->value()));
     FilterEffect* input2 = filterBuilder->getEffectById(AtomicString(m_in2->currentValue()->value()));
@@ -118,7 +128,7 @@ PassRefPtr<FilterEffect> SVGFEDisplacementMapElement::build(SVGFilterBuilder* fi
     if (!input1 || !input2)
         return nullptr;
 
-    RefPtr<FilterEffect> effect = FEDisplacementMap::create(filter, m_xChannelSelector->currentValue()->enumValue(), m_yChannelSelector->currentValue()->enumValue(), m_scale->currentValue()->value());
+    RefPtrWillBeRawPtr<FilterEffect> effect = FEDisplacementMap::create(filter, m_xChannelSelector->currentValue()->enumValue(), m_yChannelSelector->currentValue()->enumValue(), m_scale->currentValue()->value());
     FilterEffectVector& inputEffects = effect->inputEffects();
     inputEffects.reserveCapacity(2);
     inputEffects.append(input1);