Add ComputedStyle constructor and getter to InterpolationEnvironment

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

 // Copyright 2016 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/CSSTranslateInterpolationType.h"
 
 #include "core/animation/CSSLengthInterpolationType.h"
 #include "core/css/CSSValueList.h"
 #include "core/css/resolver/StyleResolverState.h"
 #include "platform/transforms/TranslateTransformOperation.h"
@@ skipping 97 matching lines @@
         } else {
             component = InterpolationValue(CSSLengthInterpolationType::createNeutralInterpolableValue());
         }
         result->set(i, std::move(component.interpolableValue));
     }
     return InterpolationValue(std::move(result));
 }
 
 InterpolationValue CSSTranslateInterpolationType::maybeConvertUnderlyingValue(const InterpolationEnvironment& environment) const
 {
-    return convertTranslateOperation(environment.state().style()->translate(), environment.state().style()->effectiveZoom());
+    return convertTranslateOperation(environment.style().translate(), environment.style().effectiveZoom());
 }
 
 void CSSTranslateInterpolationType::apply(const InterpolableValue& interpolableValue, const NonInterpolableValue*, InterpolationEnvironment& environment) const
 {
     const InterpolableList& list = toInterpolableList(interpolableValue);
     const CSSToLengthConversionData& conversionData = environment.state().cssToLengthConversionData();
     Length x = CSSLengthInterpolationType::resolveInterpolableLength(*list.get(TranslateX), nullptr, conversionData, ValueRangeAll);
     Length y = CSSLengthInterpolationType::resolveInterpolableLength(*list.get(TranslateY), nullptr, conversionData, ValueRangeAll);
     float z = CSSLengthInterpolationType::resolveInterpolableLength(*list.get(TranslateZ), nullptr, conversionData, ValueRangeAll).pixels();
 
     RefPtr<TranslateTransformOperation> result = nullptr;
     if (!x.isZero() || !y.isZero() || z != 0)
         result = TranslateTransformOperation::create(x, y, z, TransformOperation::Translate3D);
-    environment.state().style()->setTranslate(result.release());
+    environment.style().setTranslate(result.release());
 }
 
 } // namespace blink