Implement AnimationEffectTimingReadOnly interface

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

Index: third_party/WebKit/Source/core/animation/KeyframeEffect.h
diff --git a/third_party/WebKit/Source/core/animation/KeyframeEffect.h b/third_party/WebKit/Source/core/animation/KeyframeEffect.h
index cfe1229062b0614a41deeb8d0137adf161acde1c..7deead1a2fe5468929b83e43b2b5ebbdd4b01ba4 100644
--- a/third_party/WebKit/Source/core/animation/KeyframeEffect.h
+++ b/third_party/WebKit/Source/core/animation/KeyframeEffect.h
@@ -32,6 +32,7 @@
 #define KeyframeEffect_h
 
 #include "core/CoreExport.h"
+#include "core/animation/AnimationEffectTiming.h"
 #include "core/animation/EffectInput.h"
 #include "core/animation/EffectModel.h"
 #include "core/animation/KeyframeEffectReadOnly.h"
@@ -41,10 +42,10 @@
 
 namespace blink {
 
-class KeyframeEffectOptions;
 class Dictionary;
 class Element;
 class ExceptionState;
+class KeyframeEffectOptions;
 class PropertyHandle;
 class SampledEffect;
 
@@ -113,6 +114,8 @@ class CORE_EXPORT KeyframeEffect final : public KeyframeEffectReadOnly {
     m_compositorAnimationIds = compositorAnimationIds;
   }
 
+  AnimationEffectTiming* timing() override;
+
   DECLARE_VIRTUAL_TRACE();
 
   void downgradeToNormal() { m_priority = DefaultPriority; }