Plumb context through for serialization.

Change-Id: I2a49f57aa7576604deeac898a7cceb36ae68d66f
diff --git a/rsAnimation.h b/rsAnimation.h
index 526a081..4e0cc89 100644
--- a/rsAnimation.h
+++ b/rsAnimation.h
@@ -36,7 +36,7 @@
 
     float eval(float) const;
 
-    virtual void serialize(OStream *stream) const;
+    virtual void serialize(Context *rsc, OStream *stream) const;
     virtual RsA3DClassID getClassId() const { return RS_A3D_CLASS_ID_ANIMATION; }
     static Animation *createFromStream(Context *rsc, IStream *stream);