Update a result vector when sampling animation effects.

Source/core/animation/InertAnimation.h

Index: Source/core/animation/InertAnimation.h
diff --git a/Source/core/animation/InertAnimation.h b/Source/core/animation/InertAnimation.h
index b85c8530a01dd5d3fc5f0f91588d1b9fcf9685a1..5283998bdac722bfd40262c2b1e7b8da63a950ac 100644
--- a/Source/core/animation/InertAnimation.h
+++ b/Source/core/animation/InertAnimation.h
@@ -40,7 +40,7 @@ namespace blink {
 class InertAnimation final : public AnimationNode {
 public:
     static PassRefPtrWillBeRawPtr<InertAnimation> create(PassRefPtrWillBeRawPtr<AnimationEffect>, const Timing&, bool paused);
-    PassOwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation> > > sample(double inheritedTime);
+    void sample(double inheritedTime, OwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation>>>&);
     AnimationEffect* effect() const { return m_effect.get(); }
     bool paused() const { return m_paused; }