Oilpan: enable eager tracing of common animation objects.

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 4146a0ca0da09ae4d983bd224753637b11627b7a..4ca554caf318d537b61d1546b369b0b6f720aa11 100644
--- a/Source/core/animation/InterpolationEffect.h
+++ b/Source/core/animation/InterpolationEffect.h
@@ -28,11 +28,6 @@ public:
 
     void trace(Visitor*);
 
-private:
-    InterpolationEffect()
-    {
-    }
-
     class InterpolationRecord : public NoBaseWillBeGarbageCollectedFinalized<InterpolationRecord> {
     public:
         RefPtrWillBeMember<Interpolation> m_interpolation;
@@ -61,9 +56,17 @@ private:
         }
     };
 
+private:
+    InterpolationEffect()
+    {
+    }
+
     WillBeHeapVector<OwnPtrWillBeMember<InterpolationRecord> > m_interpolations;
 };
 
-}
+WILL_BE_EAGERLY_TRACED(InterpolationEffect);
+WILL_BE_EAGERLY_TRACED(InterpolationEffect::InterpolationRecord);
+
+} // namespace blink
 
-#endif
+#endif // InterpolationEffect_h