Introduce KeyframeEffectReadOnly interface

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

Index: third_party/WebKit/Source/core/animation/KeyframeEffect.cpp
diff --git a/third_party/WebKit/Source/core/animation/KeyframeEffect.cpp b/third_party/WebKit/Source/core/animation/KeyframeEffect.cpp
index e0e76491fb6446edc3317a145a4c2313d8f1366c..fb3984b37a43a2b191d2472aba387867383e41cd 100644
--- a/third_party/WebKit/Source/core/animation/KeyframeEffect.cpp
+++ b/third_party/WebKit/Source/core/animation/KeyframeEffect.cpp
@@ -39,6 +39,7 @@
 #include "core/animation/Interpolation.h"
 #include "core/animation/KeyframeEffectModel.h"
 #include "core/animation/KeyframeEffectOptions.h"
+#include "core/animation/KeyframeEffectReadOnly.h"
 #include "core/animation/PropertyHandle.h"
 #include "core/dom/Element.h"
 #include "core/dom/NodeComputedStyle.h"
@@ -48,7 +49,7 @@
 
 namespace blink {
 
-KeyframeEffect* KeyframeEffect::create(Element* target, EffectModel* model, const Timing& timing, Priority priority, EventDelegate* eventDelegate)
+KeyframeEffect* KeyframeEffect::create(Element* target, EffectModel* model, const Timing& timing, KeyframeEffectReadOnly::Priority priority, EventDelegate* eventDelegate)
 {
     return new KeyframeEffect(target, model, timing, priority, eventDelegate);
 }
@@ -84,12 +85,8 @@ KeyframeEffect* KeyframeEffect::create(ExecutionContext* executionContext, Eleme
     return create(element, EffectInput::convert(element, effectInput, executionContext, exceptionState), Timing());
 }
 
-KeyframeEffect::KeyframeEffect(Element* target, EffectModel* model, const Timing& timing, Priority priority, EventDelegate* eventDelegate)
-    : AnimationEffectReadOnly(timing, eventDelegate)
-    , m_target(target)
-    , m_model(model)
-    , m_sampledEffect(nullptr)
-    , m_priority(priority)
+KeyframeEffect::KeyframeEffect(Element* target, EffectModel* model, const Timing& timing, KeyframeEffectReadOnly::Priority priority, EventDelegate* eventDelegate)
+    : KeyframeEffectReadOnly(target, model, timing, priority, eventDelegate)
 {
 }
 
@@ -363,10 +360,7 @@ void KeyframeEffect::attachCompositedLayers()
 
 DEFINE_TRACE(KeyframeEffect)
 {
-    visitor->trace(m_target);
-    visitor->trace(m_model);
-    visitor->trace(m_sampledEffect);
-    AnimationEffectReadOnly::trace(visitor);
+    KeyframeEffectReadOnly::trace(visitor);
 }
 
 } // namespace blink