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 65f05aebeca5e676b3fa6d3ad8073800888e196c..06771a7514900673557c43e452836e7483ca1292 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;
 
@@ -88,6 +89,8 @@ public:
 
     void setCompositorAnimationIdsForTesting(const Vector<int>& compositorAnimationIds) { m_compositorAnimationIds = compositorAnimationIds; }
 
+    AnimationEffectTiming* timing() override;
+
     DECLARE_VIRTUAL_TRACE();
 
     void downgradeToNormal() { m_priority = DefaultPriority; }