Modify AnimationEffect::sample() to return a CompositableValue

Source/core/animation/AnimatableValue.cpp

Index: Source/core/animation/AnimatableValue.cpp
diff --git a/Source/core/animation/AnimationEffect.cpp b/Source/core/animation/AnimatableValue.cpp
similarity index 78%
rename from Source/core/animation/AnimationEffect.cpp
rename to Source/core/animation/AnimatableValue.cpp
index 0ea7b0bedea3209372a557861f6cfc171ca8620e..6631605a14de846f723a2058a16d1e98e69da76b 100644
--- a/Source/core/animation/AnimationEffect.cpp
+++ b/Source/core/animation/AnimatableValue.cpp
@@ -29,25 +29,14 @@
  */
 
 #include "config.h"
-#include "core/animation/AnimationEffect.h"
-
-#include "core/css/StylePropertySet.h"
+#include "core/animation/AnimatableValue.h"
 
 namespace WebCore {
 
-PassRefPtr<AnimationEffect> AnimationEffect::create()
-{
-    return adoptRef(new AnimationEffect());
-}
-
-AnimationEffect::AnimationEffect()
-{
-}
-
-// FIXME: This shouldn't directly generate StylePropertySet values.
-PassRefPtr<StylePropertySet> AnimationEffect::sample(double fraction, int iteration)
+PassRefPtr<CSSValue> AnimatableValue::toCSSValue() const
 {
-    return StylePropertySet::create(0, 0);
+    ASSERT_NOT_REACHED();
+    return 0;
 }
 
-} // namespace
+} // namespace WebCore