Plumb context through for serialization.

Change-Id: I2a49f57aa7576604deeac898a7cceb36ae68d66f
diff --git a/rsProgramRaster.h b/rsProgramRaster.h
index c552ea3..e9a524b 100644
--- a/rsProgramRaster.h
+++ b/rsProgramRaster.h
@@ -46,7 +46,7 @@
     Hal mHal;
 
     virtual void setup(const Context *, ProgramRasterState *);
-    virtual void serialize(OStream *stream) const;
+    virtual void serialize(Context *rsc, OStream *stream) const;
     virtual RsA3DClassID getClassId() const { return RS_A3D_CLASS_ID_PROGRAM_RASTER; }
     static ProgramRaster *createFromStream(Context *rsc, IStream *stream);