Introduce KeyframeEffectReadOnly interface

third_party/WebKit/Source/core/svg/SVGElement.cpp

Index: third_party/WebKit/Source/core/svg/SVGElement.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGElement.cpp b/third_party/WebKit/Source/core/svg/SVGElement.cpp
index dacddb325e44aeb7bc36b7d7c06a9ecf759f8bb1..cf78f5f1e19f20a74fe21a3ca192b3b7638bd141 100644
--- a/third_party/WebKit/Source/core/svg/SVGElement.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGElement.cpp
@@ -32,6 +32,7 @@
 #include "core/animation/ElementAnimations.h"
 #include "core/animation/InterpolationEnvironment.h"
 #include "core/animation/InvalidatableInterpolation.h"
+#include "core/animation/KeyframeEffectReadOnly.h"
 #include "core/css/CSSCursorImageValue.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Document.h"
@@ -227,7 +228,7 @@ static bool isSVGAttributeHandle(const PropertyHandle& propertyHandle)
 void SVGElement::applyActiveWebAnimations()
 {
     ActiveInterpolationsMap activeInterpolationsMap = AnimationStack::activeInterpolations(
-        &elementAnimations()->animationStack(), nullptr, nullptr, KeyframeEffect::DefaultPriority, isSVGAttributeHandle);
+        &elementAnimations()->animationStack(), nullptr, nullptr, KeyframeEffectReadOnly::DefaultPriority, isSVGAttributeHandle);
     for (auto& entry : activeInterpolationsMap) {
         const QualifiedName& attribute = entry.key.svgAttribute();
         InterpolationEnvironment environment(*this, propertyFromAttribute(attribute)->baseValueBase());