Make InterpolationEnvironment virutal

third_party/WebKit/Source/core/animation/TransitionInterpolation.cpp

 // Copyright 2017 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.
 
 #include "core/animation/TransitionInterpolation.h"
 
 #include "core/animation/CSSInterpolationTypesMap.h"
 #include "core/animation/InterpolationEnvironment.h"
 #include "core/animation/InterpolationType.h"
 #include "core/css/resolver/StyleResolverState.h"
@@ skipping 29 matching lines @@
     return start_.non_interpolable_value.Get();
   }
   if (cached_fraction_ == 1) {
     return end_.non_interpolable_value.Get();
   }
   return merge_.non_interpolable_value.Get();
 }
 
 void TransitionInterpolation::Apply(StyleResolverState& state) const {
   CSSInterpolationTypesMap map(state.GetDocument().GetPropertyRegistry());
-  InterpolationEnvironment environment(map, state);
+  CSSInterpolationEnvironment environment(map, state);
   type_.Apply(CurrentInterpolableValue(), CurrentNonInterpolableValue(),
               environment);
 }
 
 std::unique_ptr<TypedInterpolationValue>
 TransitionInterpolation::GetInterpolatedValue() const {
   return TypedInterpolationValue::Create(
       type_, CurrentInterpolableValue().Clone(), CurrentNonInterpolableValue());
 }
 
 RefPtr<AnimatableValue>
 TransitionInterpolation::GetInterpolatedCompositorValue() const {
   return AnimatableValue::Interpolate(compositor_start_.Get(),
                                       compositor_end_.Get(), cached_fraction_);
 }
 
 }  // namespace blink