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

Source/core/animation/Interpolation.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/animation/Interpolation.h"
 
 #include "core/css/resolver/AnimatedStyleBuilder.h"
 #include "core/css/resolver/StyleResolverState.h"
 
@@ skipping 36 matching lines @@
 
 void Interpolation::interpolate(int iteration, double fraction) const
 {
     if (m_cachedFraction != fraction || m_cachedIteration != iteration) {
         m_cachedValue = m_start->interpolate(*m_end, fraction);
         m_cachedIteration = iteration;
         m_cachedFraction = fraction;
     }
 }
 
+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);
 }
+
+}