Add ComputedStyle constructor and getter to InterpolationEnvironment

third_party/WebKit/Source/core/animation/CSSFontWeightInterpolationType.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/CSSFontWeightInterpolationType.h"
 
 #include "core/css/CSSPrimitiveValueMappings.h"
 #include "core/css/resolver/StyleResolverState.h"
 #include "wtf/PtrUtil.h"
 #include <memory>
@@ skipping 111 matching lines @@
         return createFontWeightValue(FontDescription::lighterWeight(inheritedFontWeight));
     }
 
     default:
         return createFontWeightValue(primitiveValue.convertTo<FontWeight>());
     }
 }
 
 InterpolationValue CSSFontWeightInterpolationType::maybeConvertUnderlyingValue(const InterpolationEnvironment& environment) const
 {
-    return createFontWeightValue(environment.state().style()->fontWeight());
+    return createFontWeightValue(environment.style().fontWeight());
 }
 
 void CSSFontWeightInterpolationType::apply(const InterpolableValue& interpolableValue, const NonInterpolableValue*, InterpolationEnvironment& environment) const
 {
     environment.state().fontBuilder().setWeight(doubleToFontWeight(toInterpolableNumber(interpolableValue).value()));
 }
 
 } // namespace blink