Add ComputedStyle constructor and getter to InterpolationEnvironment

third_party/WebKit/Source/core/animation/CSSBorderImageLengthBoxInterpolationType.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/CSSBorderImageLengthBoxInterpolationType.h"
 
 #include "core/animation/BorderImageLengthBoxPropertyFunctions.h"
 #include "core/animation/CSSLengthInterpolationType.h"
 #include "core/css/CSSQuadValue.h"
 #include "core/css/resolver/StyleResolverState.h"
@@ skipping 201 matching lines @@
             list->set(i, std::move(convertedSide.interpolableValue));
             nonInterpolableValues[i] = convertedSide.nonInterpolableValue.release();
         }
     }
 
     return InterpolationValue(std::move(list), CSSBorderImageLengthBoxNonInterpolableValue::create(SideNumbers(quad), std::move(nonInterpolableValues)));
 }
 
 InterpolationValue CSSBorderImageLengthBoxInterpolationType::maybeConvertUnderlyingValue(const InterpolationEnvironment& environment) const
 {
-    const ComputedStyle& style = *environment.state().style();
+    const ComputedStyle& style = environment.style();
     return convertBorderImageLengthBox(BorderImageLengthBoxPropertyFunctions::getBorderImageLengthBox(cssProperty(), style), style.effectiveZoom());
 }
 
 PairwiseInterpolationValue CSSBorderImageLengthBoxInterpolationType::maybeMergeSingles(InterpolationValue&& start, InterpolationValue&& end) const
 {
     const SideNumbers& startSideNumbers = toCSSBorderImageLengthBoxNonInterpolableValue(*start.nonInterpolableValue).sideNumbers();
     const SideNumbers& endSideNumbers = toCSSBorderImageLengthBoxNonInterpolableValue(*end.nonInterpolableValue).sideNumbers();
 
     if (startSideNumbers != endSideNumbers)
         return nullptr;
@@ skipping 34 matching lines @@
     const auto& convertSide = [&sideNumbers, &list, &environment, &nonInterpolableValues](size_t index) -> BorderImageLength {
         if (sideNumbers.isNumber[index])
             return clampTo<double>(toInterpolableNumber(list.get(index))->value(), 0);
         return CSSLengthInterpolationType::resolveInterpolableLength(*list.get(index), nonInterpolableValues[index].get(), environment.state().cssToLengthConversionData(), ValueRangeNonNegative);
     };
     BorderImageLengthBox box(
         convertSide(SideTop),
         convertSide(SideRight),
         convertSide(SideBottom),
         convertSide(SideLeft));
-    BorderImageLengthBoxPropertyFunctions::setBorderImageLengthBox(cssProperty(), *environment.state().style(), box);
+    BorderImageLengthBoxPropertyFunctions::setBorderImageLengthBox(cssProperty(), environment.style(), box);
 }
 
 } // namespace blink