Update a result vector when sampling animation effects.

Source/core/animation/InterpolationEffect.h

Index: Source/core/animation/InterpolationEffect.h
diff --git a/Source/core/animation/InterpolationEffect.h b/Source/core/animation/InterpolationEffect.h
index cfe02560c2d46b1938990613d90784c78926b2fa..4146a0ca0da09ae4d983bd224753637b11627b7a 100644
--- a/Source/core/animation/InterpolationEffect.h
+++ b/Source/core/animation/InterpolationEffect.h
@@ -14,9 +14,12 @@ namespace blink {
 
 class InterpolationEffect : public RefCountedWillBeGarbageCollected<InterpolationEffect> {
 public:
-    static PassRefPtrWillBeRawPtr<InterpolationEffect> create() { return adoptRefWillBeNoop(new InterpolationEffect()); }
+    static PassRefPtrWillBeRawPtr<InterpolationEffect> create()
+    {
+        return adoptRefWillBeNoop(new InterpolationEffect());
+    }
 
-    PassOwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation> > > getActiveInterpolations(double fraction, double iterationDuration) const;
+    void getActiveInterpolations(double fraction, double iterationDuration, OwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation>>>&) const;
 
     void addInterpolation(PassRefPtrWillBeRawPtr<Interpolation> interpolation, PassRefPtr<TimingFunction> easing, double start, double end, double applyFrom, double applyTo)
     {