[Oilpan] Migrate most classes under core/animations to Oilpan 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"
 
 namespace blink {
 
 namespace {
@@ skipping 16 matching lines @@
         return false;
     for (size_t i = 0; i < startList->length(); ++i) {
         if (!typesMatch(startList->get(i), endList->get(i)))
             return false;
     }
     return true;
 }
 
 }
 
-Interpolation::Interpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end)
+Interpolation::Interpolation(InterpolableValue* start, InterpolableValue* end)
     : m_start(start)
     , m_end(end)
     , m_cachedFraction(0)
     , m_cachedIteration(0)
     , m_cachedValue(m_start ? m_start->clone() : nullptr)
 {
     RELEASE_ASSERT(typesMatch(m_start.get(), m_end.get()));
 }
 
 Interpolation::~Interpolation()
@@ skipping 10 matching lines @@
 }
 
 DEFINE_TRACE(Interpolation)
 {
     visitor->trace(m_start);
     visitor->trace(m_end);
     visitor->trace(m_cachedValue);
 }
 
 }