Make InterpolationEnvironment virutal

third_party/WebKit/Source/core/animation/css/CSSAnimations.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 671 matching lines @@
                  property.CssProperty(), state.old_style, state.style)) {
     return;
   }
 
   if (!to)
     to = CSSAnimatableValueFactory::Create(property, state.style);
   RefPtr<AnimatableValue> from =
       CSSAnimatableValueFactory::Create(property, state.old_style);
 
   CSSInterpolationTypesMap map(registry);
-  InterpolationEnvironment old_environment(map, state.old_style);
-  InterpolationEnvironment new_environment(map, state.style);
+  CSSInterpolationEnvironment old_environment(map, state.old_style);
+  CSSInterpolationEnvironment new_environment(map, state.style);
   InterpolationValue start = nullptr;
   InterpolationValue end = nullptr;
   const InterpolationType* transition_type = nullptr;
   for (const auto& interpolation_type : map.Get(property)) {
     start = interpolation_type->MaybeConvertUnderlyingValue(old_environment);
     if (!start) {
       continue;
     }
     end = interpolation_type->MaybeConvertUnderlyingValue(new_environment);
     if (!end) {
@@ skipping 526 matching lines @@
              IsCustomPropertyHandle);
 }
 
 DEFINE_TRACE(CSSAnimations) {
   visitor->Trace(transitions_);
   visitor->Trace(pending_update_);
   visitor->Trace(running_animations_);
 }
 
 }  // namespace blink