Oilpan: Move AnimatableValue's hierarchy to oilpan's heap

Source/core/animation/AnimatableDouble.h

Index: Source/core/animation/AnimatableDouble.h
diff --git a/Source/core/animation/AnimatableDouble.h b/Source/core/animation/AnimatableDouble.h
index 172674c595e155db3ada2c512f26e41ff2ad33d1..3891ec12d29eac80d13d12ef78f7b7436590dbe8 100644
--- a/Source/core/animation/AnimatableDouble.h
+++ b/Source/core/animation/AnimatableDouble.h
@@ -45,17 +45,19 @@ public:
         InterpolationIsNonContinuousWithZero,
     };
 
-    static PassRefPtr<AnimatableDouble> create(double number, Constraint constraint = Unconstrained)
+    static PassRefPtrWillBeRawPtr<AnimatableDouble> create(double number, Constraint constraint = Unconstrained)
     {
-        return adoptRef(new AnimatableDouble(number, constraint));
+        return adoptRefWillBeNoop(new AnimatableDouble(number, constraint));
     }
 
     PassRefPtrWillBeRawPtr<CSSValue> toCSSValue() const;
     double toDouble() const { return m_number; }
 
+    virtual void trace(Visitor*) OVERRIDE { }
+
 protected:
-    virtual PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const OVERRIDE;
-    virtual PassRefPtr<AnimatableValue> addWith(const AnimatableValue*) const OVERRIDE;
+    virtual PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const OVERRIDE;
+    virtual PassRefPtrWillBeRawPtr<AnimatableValue> addWith(const AnimatableValue*) const OVERRIDE;
     virtual bool usesDefaultInterpolationWith(const AnimatableValue*) const OVERRIDE;
 
 private: