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

Source/core/animation/animatable/AnimatableFilterOperations.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 23 matching lines @@
 #include <algorithm>
 
 namespace blink {
 
 bool AnimatableFilterOperations::usesDefaultInterpolationWith(const AnimatableValue* value) const
 {
     const AnimatableFilterOperations* target = toAnimatableFilterOperations(value);
     return !operations().canInterpolateWith(target->operations());
 }
 
-PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableFilterOperations::interpolateTo(const AnimatableValue* value, double fraction) const
+AnimatableValue* AnimatableFilterOperations::interpolateTo(const AnimatableValue* value, double fraction) const
 {
     if (usesDefaultInterpolationWith(value))
         return defaultInterpolateTo(this, value, fraction);
 
     const AnimatableFilterOperations* target = toAnimatableFilterOperations(value);
     FilterOperations result;
     size_t fromSize = operations().size();
     size_t toSize = target->operations().size();
     size_t size = std::max(fromSize, toSize);
     for (size_t i = 0; i < size; i++) {
@@ skipping 13 matching lines @@
     return operations() == toAnimatableFilterOperations(value)->operations();
 }
 
 DEFINE_TRACE(AnimatableFilterOperations)
 {
     visitor->trace(m_operations);
     AnimatableValue::trace(visitor);
 }
 
 } // namespace blink