[Oilpan] Migrate most classes under core/animations to Oilpan heap.

Source/core/animation/VisibilityStyleInterpolation.cpp

 #include "config.h"
 #include "core/animation/VisibilityStyleInterpolation.h"
 
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/resolver/StyleBuilder.h"
 
 namespace blink {
 
 bool VisibilityStyleInterpolation::canCreateFrom(const CSSValue& value)
 {
     return value.isPrimitiveValue() && toCSSPrimitiveValue(value).isValueID();
 }
 
 bool VisibilityStyleInterpolation::isVisible(const CSSValue& value)
 {
     return toCSSPrimitiveValue(value).getValueID() == CSSValueVisible;
 }
 
-PassOwnPtrWillBeRawPtr<InterpolableValue> VisibilityStyleInterpolation::visibilityToInterpolableValue(const CSSValue& value)
+InterpolableValue* VisibilityStyleInterpolation::visibilityToInterpolableValue(const CSSValue& value)
 {
     ASSERT(value.isPrimitiveValue());
     const CSSPrimitiveValue& primitive = toCSSPrimitiveValue(value);
     ASSERT(primitive.isValueID());
     const CSSValueID valueID = primitive.getValueID();
 
     if (valueID == CSSValueVisible) {
         return InterpolableNumber::create(1.0);
     }
     return InterpolableNumber::create(0.0);
@@ skipping 12 matching lines @@
 void VisibilityStyleInterpolation::apply(StyleResolverState& state) const
 {
     StyleBuilder::applyProperty(m_id, state, interpolableValueToVisibility(m_cachedValue.get(), m_notVisible).get());
 }
 
 DEFINE_TRACE(VisibilityStyleInterpolation)
 {
     StyleInterpolation::trace(visitor);
 }
 }