Add foundation for removing AnimatableValues from StyleInterpolation

Source/core/animation/CSSValueAnimationType.h

Index: Source/core/animation/CSSValueAnimationType.h
diff --git a/Source/core/animation/CSSValueAnimationType.h b/Source/core/animation/CSSValueAnimationType.h
new file mode 100644
index 0000000000000000000000000000000000000000..bc2b3cde7db906f16e833c94e2bebbc26ac15847
--- /dev/null
+++ b/Source/core/animation/CSSValueAnimationType.h
@@ -0,0 +1,54 @@
+// Copyright 2015 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 CSSValueAnimationType_h
+#define CSSValueAnimationType_h
+
+#include "core/animation/AnimationType.h"
+
+namespace blink {
+
+// Never supports pairwise conversion while always supporting single conversion.
+// A catch all for default for CSSValues.
+class CSSValueAnimationType : public AnimationType {
+public:
+    CSSValueAnimationType(CSSPropertyID property)
+        : AnimationType(property)
+    { }
+
+    virtual PassOwnPtrWillBeRawPtr<FlipPrimitiveInterpolation::Side> maybeConvertSingle(const CSSPropertySpecificKeyframe&, const StyleResolverState*, ConversionCheckers&) const override final;
+    virtual void apply(const InterpolableValue&, const NonInterpolableValue*, StyleResolverState&) const override final;
+};
+
+class DefaultNonInterpolableValue : public NonInterpolableValue {
+public:
+    virtual ~DefaultNonInterpolableValue() { }
+    static PassRefPtrWillBeRawPtr<DefaultNonInterpolableValue> create(PassRefPtrWillBeRawPtr<CSSValue> cssValue)
+    {
+        return adoptRefWillBeNoop(new DefaultNonInterpolableValue(cssValue));
+    }
+
+    CSSValue* cssValue() const { return m_cssValue.get(); }
+
+    DEFINE_INLINE_VIRTUAL_TRACE()
+    {
+        NonInterpolableValue::trace(visitor);
+        visitor->trace(m_cssValue);
+    }
+
+    DECLARE_NON_INTERPOLABLE_VALUE_TYPE();
+
+private:
+    DefaultNonInterpolableValue(PassRefPtrWillBeRawPtr<CSSValue> cssValue)
+        : m_cssValue(cssValue)
+    { }
+
+    RefPtrWillBeMember<CSSValue> m_cssValue;
+};
+
+DEFINE_NON_INTERPOLABLE_VALUE_TYPE_CASTS(DefaultNonInterpolableValue);
+
+} // namespace blink
+
+#endif // CSSValueAnimationType_h