Update a result vector when sampling animation effects.

Source/core/animation/AnimationStack.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 41 matching lines @@
 
 bool compareEffects(const OwnPtrWillBeMember<SampledEffect>& effect1, const OwnPtrWillBeMember<SampledEffect>& effect2)
 {
     ASSERT(effect1 && effect2);
     return effect1->sequenceNumber() < effect2->sequenceNumber();
 }
 
 void copyNewAnimationsToActiveInterpolationMap(const WillBeHeapVector<RawPtrWillBeMember<InertAnimation> >& newAnimations, WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<Interpolation> >& result)
 {
     for (size_t i = 0; i < newAnimations.size(); ++i) {
-        OwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation> > > sample = newAnimations[i]->sample(0);
-        if (sample) {
+        OwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation>>> sample = nullptr;
+        newAnimations[i]->sample(0, sample);
+        if (sample)
             copyToActiveInterpolationMap(*sample, result);
-        }
     }
 }
 
 } // namespace
 
 AnimationStack::AnimationStack()
 {
 }
 
 bool AnimationStack::affects(CSSPropertyID property) const
@@ skipping 85 matching lines @@
             FloatBox expandingBox(originalBox);
             if (!CompositorAnimations::instance()->getAnimatedBoundingBox(expandingBox, *anim->effect(), startRange, endRange))
                 return false;
             box.expandTo(expandingBox);
         }
     }
     return true;
 }
 
 } // namespace blink