[wip] interpolable value refactor. NOT FOR LANDING.

Source/core/animation/KeyframeEffectModel.h

Index: Source/core/animation/KeyframeEffectModel.h
diff --git a/Source/core/animation/KeyframeEffectModel.h b/Source/core/animation/KeyframeEffectModel.h
index 9ec92d0541ba0d4c622c94d30d2e6c38fa725655..f019b153018f6f545bf6bb0a5b400f0fd4c6a73a 100644
--- a/Source/core/animation/KeyframeEffectModel.h
+++ b/Source/core/animation/KeyframeEffectModel.h
@@ -33,6 +33,7 @@
 
 #include "core/animation/AnimatableValue.h"
 #include "core/animation/AnimationEffect.h"
+#include "core/animation/InterpolationEffect.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
 #include "wtf/PassOwnPtr.h"
@@ -92,7 +93,7 @@ public:
     }
 
     // AnimationEffect implementation.
-    virtual PassOwnPtr<CompositableValueList> sample(int iteration, double fraction) const OVERRIDE;
+    virtual PassOwnPtr<Vector<RefPtr<Interpolation> > > sample(int iteration, double fraction) const OVERRIDE;
 
     // FIXME: Implement setFrames()
     const KeyframeVector& getFrames() const { return m_keyframes; }
@@ -136,9 +137,12 @@ public:
 private:
     KeyframeEffectModel(const KeyframeVector& keyframes);
 
+    KeyframeEffectModel(PassRefPtr<InterpolationEffect> interpolationEffect);
+
     KeyframeVector normalizedKeyframes() const;
     // Lazily computes the groups of property-specific keyframes.
     void ensureKeyframeGroups() const;
+    void ensureInterpolationEffect() const;
 
     KeyframeVector m_keyframes;
     // The spec describes filtering the normalized keyframes at sampling time
@@ -146,6 +150,8 @@ private:
     // property-specific lists.
     typedef HashMap<CSSPropertyID, OwnPtr<PropertySpecificKeyframeGroup> > KeyframeGroupMap;
     mutable OwnPtr<KeyframeGroupMap> m_keyframeGroups;
+
+    mutable RefPtr<InterpolationEffect> m_interpolationEffect;
 };
 
 DEFINE_TYPE_CASTS(KeyframeEffectModel, AnimationEffect, value, value->isKeyframeEffectModel(), value.isKeyframeEffectModel());