Update a result vector when sampling animation effects.

Source/core/animation/Animation.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 131 matching lines @@
 
 void Animation::applyEffects()
 {
     ASSERT(isInEffect());
     ASSERT(player());
     if (!m_target || !m_effect)
         return;
 
     double iteration = currentIteration();
     ASSERT(iteration >= 0);
+    OwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation> > > interpolations = m_sampledEffect ? m_sampledEffect->mutableInterpolations() : nullptr;
     // FIXME: Handle iteration values which overflow int.
-    OwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation> > > interpolations = m_effect->sample(static_cast<int>(iteration), timeFraction(), iterationDuration());
+    m_effect->sample(static_cast<int>(iteration), timeFraction(), iterationDuration(), interpolations);
     if (m_sampledEffect) {
         m_sampledEffect->setInterpolations(interpolations.release());
-    } else if (!interpolations->isEmpty()) {
+    } else if (interpolations && !interpolations->isEmpty()) {
         OwnPtrWillBeRawPtr<SampledEffect> sampledEffect = SampledEffect::create(this, interpolations.release());
         m_sampledEffect = sampledEffect.get();
         ensureAnimationStack(m_target).add(sampledEffect.release());
     } else {
         return;
     }
 
     m_target->setNeedsAnimationStyleRecalc();
 }
 
@@ skipping 145 matching lines @@
 
 void Animation::trace(Visitor* visitor)
 {
     visitor->trace(m_target);
     visitor->trace(m_effect);
     visitor->trace(m_sampledEffect);
     AnimationNode::trace(visitor);
 }
 
 } // namespace blink