Fill incomplete images in SkCodec parent class

include/codec/SkScaledCodec.h

Index: include/codec/SkScaledCodec.h
diff --git a/include/codec/SkScaledCodec.h b/include/codec/SkScaledCodec.h
index 1bcdf085b213f7eaab1cb9d9eca51a491138c58f..66f3dcbbeb4cade766ccba09484fd9f7b0cb1fb6 100644
--- a/include/codec/SkScaledCodec.h
+++ b/include/codec/SkScaledCodec.h
@@ -49,7 +49,7 @@ protected:
      */
     SkISize onGetScaledDimensions(float desiredScale) const override;
 
-    Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMColor*, int*)
+    Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMColor*, int*, int*)
             override;
     SkEncodedFormat onGetEncodedFormat() const override {
         return fScanlineDecoder->getEncodedFormat();
@@ -59,6 +59,10 @@ protected:
         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;