Combine {Legacy,}StyleInterpolation.h

third_party/WebKit/Source/core/animation/StyleInterpolation.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 StyleInterpolation_h
-#define StyleInterpolation_h
-
-#include "core/CSSPropertyNames.h"
-#include "core/CoreExport.h"
-#include "core/animation/Interpolation.h"
-#include "core/animation/PropertyHandle.h"
-#include <memory>
-
-namespace blink {
-
-class StyleResolverState;
-
-class CORE_EXPORT StyleInterpolation : public Interpolation {
- public:
-  // 1) convert m_cachedValue into an X
-  // 2) shove X into StyleResolverState
-  // X can be:
-  // (1) a CSSValue (and applied via StyleBuilder::applyProperty)
-  // (2) an AnimatableValue (and applied via
-  //     AnimatedStyleBuilder::applyProperty)
-  // (3) a custom value that is inserted directly into the StyleResolverState.
-  virtual void apply(StyleResolverState&) const = 0;
-
-  bool isStyleInterpolation() const final { return true; }
-
-  CSSPropertyID id() const { return m_id; }
-
-  PropertyHandle getProperty() const final { return PropertyHandle(id()); }
-
- protected:
-  CSSPropertyID m_id;
-
-  StyleInterpolation(std::unique_ptr<InterpolableValue> start,
-                     std::unique_ptr<InterpolableValue> end,
-                     CSSPropertyID id)
-      : Interpolation(std::move(start), std::move(end)), m_id(id) {}
-};
-
-DEFINE_TYPE_CASTS(StyleInterpolation,
-                  Interpolation,
-                  value,
-                  value->isStyleInterpolation(),
-                  value.isStyleInterpolation());
-
-}  // namespace blink
-
-#endif