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 61208e316aa14f282962b3ddc896c9c418a16fbb..028706bc9400bfb7028ba75699029d2454277484 100644
--- a/include/codec/SkScaledCodec.h
+++ b/include/codec/SkScaledCodec.h
@@ -34,7 +34,7 @@ protected:
     SkISize onGetScaledDimensions(float desiredScale) const override;
     bool onDimensionsSupported(const SkISize&) 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 fCodec->getEncodedFormat();
@@ -44,6 +44,10 @@ protected:
         return fCodec->reallyHasAlpha();
     }
 
+    uint32_t onGetFillValue(SkColorType colorType, SkAlphaType alphaType) const override;
+
+    SkScanlineOrder onGetScanlineOrder() const override;
+
 private:
 
     SkAutoTDelete<SkCodec> fCodec;