Fill incomplete images in SkCodec parent class

include/codec/SkScaledCodec.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkScaledCodec_DEFINED
 #define SkScaledCodec_DEFINED
 
 #include "SkCodec.h"
@@ skipping 41 matching lines @@
     Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMColor*, int*)
             override;
     SkEncodedFormat onGetEncodedFormat() const override {
         return fScanlineDecoder->getEncodedFormat();
     }
 
     bool onReallyHasAlpha() const override {
         return fScanlineDecoder->reallyHasAlpha();
     }
 
+    uint32_t onGetFillValue(const SkImageInfo& dstInfo) const override;
+
+    void* onGetFillDst(void* dst, size_t dstRowBytes, uint32_t decodedScanlines) const override;
+
 private:
 
     SkAutoTDelete<SkScanlineDecoder> fScanlineDecoder;
 
     explicit SkScaledCodec(SkScanlineDecoder*);
 
     typedef SkCodec INHERITED;
 };
 #endif // SkScaledCodec_DEFINED