Discard SampledEffects on elements if they are redundant

third_party/WebKit/Source/core/animation/SampledEffect.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SampledEffect_h
 #define SampledEffect_h
 
 #include "core/animation/Animation.h"
 #include "core/animation/Interpolation.h"
 #include "core/animation/KeyframeEffect.h"
@@ skipping 15 matching lines @@
     }
 
     void clear();
 
     const Vector<RefPtr<Interpolation>>& interpolations() const { return m_interpolations; }
     Vector<RefPtr<Interpolation>>& mutableInterpolations() { return m_interpolations; }
 
     KeyframeEffect* effect() const { return m_effect; }
     unsigned sequenceNumber() const { return m_sequenceNumber; }
     KeyframeEffect::Priority priority() const { return m_priority; }
+    bool willNeverChange() const;
+    void removeReplacedInterpolations(const HashSet<PropertyHandle>&);
+    void updateReplacedProperties(HashSet<PropertyHandle>&);
 
     DECLARE_TRACE();
 
 private:
     SampledEffect(KeyframeEffect*);
 
     WeakMember<KeyframeEffect> m_effect;
-    Member<Animation> m_animation;
     Vector<RefPtr<Interpolation>> m_interpolations;
     const unsigned m_sequenceNumber;
     KeyframeEffect::Priority m_priority;
 };
 
 } // namespace blink
 
 #endif // SampledEffect_h