Make InterpolationEnvironment virutal

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

 // 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 InterpolationEnvironment_h
 #define InterpolationEnvironment_h
 
 #include "core/animation/InterpolationTypesMap.h"
-#include "core/css/resolver/StyleResolverState.h"
-#include "platform/heap/Handle.h"
 #include "platform/wtf/Allocator.h"
 
 namespace blink {
 
-class ComputedStyle;
-class SVGPropertyBase;
-class SVGElement;
-
 class InterpolationEnvironment {
   STACK_ALLOCATED();
-
  public:
-  explicit InterpolationEnvironment(const InterpolationTypesMap& map,
-                                    StyleResolverState& state)
-      : interpolation_types_map_(map), state_(&state), style_(state.Style()) {}
-
-  explicit InterpolationEnvironment(const InterpolationTypesMap& map,
-                                    const ComputedStyle& style)
-      : interpolation_types_map_(map), style_(&style) {}
-
-  explicit InterpolationEnvironment(const InterpolationTypesMap& map,
-                                    SVGElement& svg_element,
-                                    const SVGPropertyBase& svg_base_value)
-      : interpolation_types_map_(map),
-        svg_element_(&svg_element),
-        svg_base_value_(&svg_base_value) {}
+  virtual bool IsCSS() const { return false; }
+  virtual bool IsSVG() const { return false; }
 
   const InterpolationTypesMap& GetInterpolationTypesMap() const {
     return interpolation_types_map_;
   }
 
-  StyleResolverState& GetState() {
-    DCHECK(state_);
-    return *state_;
-  }
-  const StyleResolverState& GetState() const {
-    DCHECK(state_);
-    return *state_;
-  }
+ protected:
+  virtual ~InterpolationEnvironment() {}
 
-  const ComputedStyle& Style() const {
-    DCHECK(style_);
-    return *style_;
-  }
-
-  SVGElement& SvgElement() {
-    DCHECK(svg_element_);
-    return *svg_element_;
-  }
-  const SVGElement& SvgElement() const {
-    DCHECK(svg_element_);
-    return *svg_element_;
-  }
-
-  const SVGPropertyBase& SvgBaseValue() const {
-    DCHECK(svg_base_value_);
-    return *svg_base_value_;
-  }
+  explicit InterpolationEnvironment(const InterpolationTypesMap& map)
+      : interpolation_types_map_(map) {}
 
  private:
   const InterpolationTypesMap& interpolation_types_map_;
-
-  // CSSInterpolationType environment
-  StyleResolverState* state_ = nullptr;
-  const ComputedStyle* style_ = nullptr;
-
-  // SVGInterpolationType environment
-  Member<SVGElement> svg_element_ = nullptr;
-  Member<const SVGPropertyBase> svg_base_value_ = nullptr;
 };
 
 }  // namespace blink
 
 #endif  // InterpolationEnvironment_h