Add ComputedStyle constructor and getter to InterpolationEnvironment

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

 // 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.
 
 #include "core/animation/CSSVisibilityInterpolationType.h"
 
 #include "core/css/CSSPrimitiveValueMappings.h"
 #include "core/css/resolver/StyleResolverState.h"
 #include "wtf/PtrUtil.h"
 #include <memory>
@@ skipping 127 matching lines @@
     case CSSValueVisible:
     case CSSValueCollapse:
         return createVisibilityValue(primitiveValue.convertTo<EVisibility>());
     default:
         return nullptr;
     }
 }
 
 InterpolationValue CSSVisibilityInterpolationType::maybeConvertUnderlyingValue(const InterpolationEnvironment& environment) const
 {
-    return createVisibilityValue(environment.state().style()->visibility());
+    return createVisibilityValue(environment.style().visibility());
 }
 
 PairwiseInterpolationValue CSSVisibilityInterpolationType::maybeMergeSingles(InterpolationValue&& start, InterpolationValue&& end) const
 {
     return PairwiseInterpolationValue(
         InterpolableNumber::create(0),
         InterpolableNumber::create(1),
         CSSVisibilityNonInterpolableValue::create(
             toCSSVisibilityNonInterpolableValue(*start.nonInterpolableValue).visibility(),
             toCSSVisibilityNonInterpolableValue(*end.nonInterpolableValue).visibility()));
 }
 
 void CSSVisibilityInterpolationType::composite(UnderlyingValueOwner& underlyingValueOwner, double underlyingFraction, const InterpolationValue& value, double interpolationFraction) const
 {
     underlyingValueOwner.set(*this, value);
 }
 
 void CSSVisibilityInterpolationType::apply(const InterpolableValue& interpolableValue, const NonInterpolableValue* nonInterpolableValue, InterpolationEnvironment& environment) const
 {
     // Visibility interpolation has been deferred to application time here due to its non-linear behaviour.
     double fraction = toInterpolableNumber(interpolableValue).value();
     EVisibility visibility = toCSSVisibilityNonInterpolableValue(nonInterpolableValue)->visibility(fraction);
-    environment.state().style()->setVisibility(visibility);
+    environment.style().setVisibility(visibility);
 }
 
 } // namespace blink