Construct KeyframeEffectReadOnly objects

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

Index: third_party/WebKit/Source/core/animation/ElementAnimations.cpp
diff --git a/third_party/WebKit/Source/core/animation/ElementAnimations.cpp b/third_party/WebKit/Source/core/animation/ElementAnimations.cpp
index baac68c92ec8479e5b605ba41b71fbbfcdb520e4..a3d309d024649b5aa876301d2cc4cb1dcbdf5325 100644
--- a/third_party/WebKit/Source/core/animation/ElementAnimations.cpp
+++ b/third_party/WebKit/Source/core/animation/ElementAnimations.cpp
@@ -41,8 +41,9 @@ void ElementAnimations::updateAnimationFlags(ComputedStyle& style) {
     const Animation& animation = *entry.key;
     DCHECK(animation.effect());
     // FIXME: Needs to consider AnimationGroup once added.
-    DCHECK(animation.effect()->isKeyframeEffect());
-    const KeyframeEffect& effect = *toKeyframeEffect(animation.effect());
+    DCHECK(animation.effect()->isKeyframeEffectReadOnly());
+    const KeyframeEffectReadOnly& effect =
+        *toKeyframeEffectReadOnly(animation.effect());
     if (effect.isCurrent()) {
       if (effect.affects(PropertyHandle(CSSPropertyOpacity)))
         style.setHasCurrentOpacityAnimation(true);