Prepare for responsive CSS animations.

Source/core/animation/InterpolationEffect.cpp

Index: Source/core/animation/InterpolationEffect.cpp
diff --git a/Source/core/animation/InterpolationEffect.cpp b/Source/core/animation/InterpolationEffect.cpp
index fa62c0bca5204f67d14d1613f9b7a1ca262a034d..e74a8d1d92b1a7102c22d9a362820fc82fd66ebe 100644
--- a/Source/core/animation/InterpolationEffect.cpp
+++ b/Source/core/animation/InterpolationEffect.cpp
@@ -5,6 +5,9 @@
 #include "config.h"
 #include "core/animation/InterpolationEffect.h"
 
+#include "core/animation/DeferredLegacyStyleInterpolation.h"
+#include "core/animation/StyleInterpolation.h"
+
 namespace blink {
 
 void InterpolationEffect::getActiveInterpolations(double fraction, double iterationDuration, OwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<Interpolation>>>& result) const
@@ -75,6 +78,14 @@ void InterpolationEffect::addInterpolationsFromKeyframes(CSSPropertyID property,
     }
 }
 
+void InterpolationEffect::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 InterpolationEffect::InterpolationRecord::trace(Visitor* visitor)
 {
     visitor->trace(m_interpolation);