Oilpan: Move Interpolation's hierarchy to oilpan's heap

Source/core/animation/Interpolation.cpp

Index: Source/core/animation/Interpolation.cpp
diff --git a/Source/core/animation/Interpolation.cpp b/Source/core/animation/Interpolation.cpp
index 192fd2493e1b87f5e1ae19e2a12cdae140986ee2..4ceda726ea4a40398126d44d1fcc976f9e6e8524 100644
--- a/Source/core/animation/Interpolation.cpp
+++ b/Source/core/animation/Interpolation.cpp
@@ -54,10 +54,20 @@ void Interpolation::interpolate(int iteration, double fraction) const
     }
 }
 
+void StyleInterpolation::trace(Visitor* visitor)
+{
+    Interpolation::trace(visitor);
+}
+
 void LegacyStyleInterpolation::apply(StyleResolverState& state) const
 {
     AnimatableValue* value = currentValue();
     AnimatedStyleBuilder::applyProperty(m_id, state, value);
 }
 
+void LegacyStyleInterpolation::trace(Visitor* visitor)
+{
+    StyleInterpolation::trace(visitor);
+}
+
 }