Prepare for responsive CSS animations.

Source/core/animation/InterpolationEffect.h

Index: Source/core/animation/InterpolationEffect.h
diff --git a/Source/core/animation/InterpolationEffect.h b/Source/core/animation/InterpolationEffect.h
index f6c4f0d1b73eaac65a0ed3d76fe1ca7c13fd3bdb..6c885e6c0f2d660c838bb47499ac8218d1faca19 100644
--- a/Source/core/animation/InterpolationEffect.h
+++ b/Source/core/animation/InterpolationEffect.h
@@ -5,8 +5,10 @@
 #ifndef InterpolationEffect_h
 #define InterpolationEffect_h
 
+#include "core/animation/DeferredLegacyStyleInterpolation.h"
 #include "core/animation/Interpolation.h"
 #include "core/animation/Keyframe.h"
+#include "core/animation/StyleInterpolation.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/animation/TimingFunction.h"
 #include "wtf/PassOwnPtr.h"
@@ -30,6 +32,14 @@ public:
 
     void addInterpolationsFromKeyframes(CSSPropertyID, Element*, Keyframe::PropertySpecificKeyframe& keyframeA, Keyframe::PropertySpecificKeyframe& keyframeB, double applyFrom, double applyTo);
 
+    void setDeferredInterpolationsOutdated()
+    {
+        for (auto& record : m_interpolations) {
+            if (record->m_interpolation->isStyleInterpolation() && toStyleInterpolation(record->m_interpolation.get())->isDeferredLegacyStyleInterpolation())
+                toDeferredLegacyStyleInterpolation(toStyleInterpolation(record->m_interpolation.get()))->setOutdated();
+        }
+    }
+
     void trace(Visitor*);
 
 private: