Add ComputedStyle constructor and getter to InterpolationEnvironment

third_party/WebKit/Source/core/animation/CSSImageInterpolationType.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/CSSImageInterpolationType.h"
 
 #include "core/animation/ImagePropertyFunctions.h"
 #include "core/css/CSSCrossfadeValue.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/resolver/StyleResolverState.h"
@@ skipping 178 matching lines @@
     return maybeConvertStyleImage(inheritedImage, true);
 }
 
 InterpolationValue CSSImageInterpolationType::maybeConvertValue(const CSSValue& value, const StyleResolverState&, ConversionCheckers&) const
 {
     return maybeConvertCSSValue(value, true);
 }
 
 InterpolationValue CSSImageInterpolationType::maybeConvertUnderlyingValue(const InterpolationEnvironment& environment) const
 {
-    return maybeConvertStyleImage(ImagePropertyFunctions::getStyleImage(cssProperty(), *environment.state().style()), true);
+    return maybeConvertStyleImage(ImagePropertyFunctions::getStyleImage(cssProperty(), environment.style()), true);
 }
 
 void CSSImageInterpolationType::composite(UnderlyingValueOwner& underlyingValueOwner, double underlyingFraction, const InterpolationValue& value, double interpolationFraction) const
 {
     underlyingValueOwner.set(*this, value);
 }
 
 void CSSImageInterpolationType::apply(const InterpolableValue& interpolableValue, const NonInterpolableValue* nonInterpolableValue, InterpolationEnvironment& environment) const
 {
-    ImagePropertyFunctions::setStyleImage(cssProperty(), *environment.state().style(), resolveStyleImage(cssProperty(), interpolableValue, nonInterpolableValue, environment.state()));
+    ImagePropertyFunctions::setStyleImage(cssProperty(), environment.style(), resolveStyleImage(cssProperty(), interpolableValue, nonInterpolableValue, environment.state()));
 }
 
 } // namespace blink