Update a result vector when sampling animation effects.

Source/core/animation/KeyframeEffectModel.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 31 matching lines @@
 PropertySet KeyframeEffectModelBase::properties() const
 {
     PropertySet result;
     for (const auto& keyframe : m_keyframes) {
         for (const auto& property : keyframe->properties())
             result.add(property);
     }
     return result;
 }
 
-PassOwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation>>> KeyframeEffectModelBase::sample(int iteration, double fraction, double iterationDuration) const
+void KeyframeEffectModelBase::sample(int iteration, double fraction, double iterationDuration, OwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation>>>& result) const
 {
     ASSERT(iteration >= 0);
     ASSERT(!isNull(fraction));
     ensureKeyframeGroups();
     ensureInterpolationEffect();
 
-    return m_interpolationEffect->getActiveInterpolations(fraction, iterationDuration);
+    return m_interpolationEffect->getActiveInterpolations(fraction, iterationDuration, result);
 }
 
 KeyframeEffectModelBase::KeyframeVector KeyframeEffectModelBase::normalizedKeyframes(const KeyframeVector& keyframes)
 {
     double lastOffset = 0;
     KeyframeVector result;
     result.reserveCapacity(keyframes.size());
 
     for (const auto& keyframe : keyframes) {
         double offset = keyframe->offset();
@@ skipping 144 matching lines @@
 }
 
 void KeyframeEffectModelBase::PropertySpecificKeyframeGroup::trace(Visitor* visitor)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_keyframes);
 #endif
 }
 
 } // namespace