Add ComputedStyle constructor and getter to InterpolationEnvironment

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

Index: third_party/WebKit/Source/core/animation/CSSBasicShapeInterpolationType.cpp
diff --git a/third_party/WebKit/Source/core/animation/CSSBasicShapeInterpolationType.cpp b/third_party/WebKit/Source/core/animation/CSSBasicShapeInterpolationType.cpp
index 4ac573a3be86d23181237fedd371cc7ca6e9ae1b..4a5b552cfa89c5de63143ea61a39c009e1bdd80b 100644
--- a/third_party/WebKit/Source/core/animation/CSSBasicShapeInterpolationType.cpp
+++ b/third_party/WebKit/Source/core/animation/CSSBasicShapeInterpolationType.cpp
@@ -103,7 +103,7 @@ PairwiseInterpolationValue CSSBasicShapeInterpolationType::maybeMergeSingles(Int
 
 InterpolationValue CSSBasicShapeInterpolationType::maybeConvertUnderlyingValue(const InterpolationEnvironment& environment) const
 {
-    const ComputedStyle& style = *environment.state().style();
+    const ComputedStyle& style = environment.style();
     return BasicShapeInterpolationFunctions::maybeConvertBasicShape(
         BasicShapePropertyFunctions::getBasicShape(cssProperty(), style), style.effectiveZoom());
 }
@@ -120,7 +120,7 @@ void CSSBasicShapeInterpolationType::composite(UnderlyingValueOwner& underlyingV
 
 void CSSBasicShapeInterpolationType::apply(const InterpolableValue& interpolableValue, const NonInterpolableValue* nonInterpolableValue, InterpolationEnvironment& environment) const
 {
-    BasicShapePropertyFunctions::setBasicShape(cssProperty(), *environment.state().style(),
+    BasicShapePropertyFunctions::setBasicShape(cssProperty(), environment.style(),
         BasicShapeInterpolationFunctions::createBasicShape(interpolableValue, *nonInterpolableValue, environment.state().cssToLengthConversionData()));
 }