change old picture serialization to really handle images

src/image/SkImage_Base.h

Index: src/image/SkImage_Base.h
diff --git a/src/image/SkImage_Base.h b/src/image/SkImage_Base.h
index 3bbff58a18a7efa25cb7ca8371f7be39f1fa5456..0793abb7bc8241967e6ca865b85f73f99b6770aa 100644
--- a/src/image/SkImage_Base.h
+++ b/src/image/SkImage_Base.h
@@ -59,6 +59,7 @@ public:
     // newWidth > 0, newHeight > 0, subset either NULL or a proper subset of this bounds
     virtual SkImage* onNewImage(int newWidth, int newHeight, const SkIRect* subset,
                                 SkFilterQuality) const;
+    virtual SkData* onRefEncoded() const { return NULL; }
 
 private:
     const SkSurfaceProps fProps;