Fill incomplete images in SkCodec parent class

src/codec/SkBmpStandardCodec.h

Index: src/codec/SkBmpStandardCodec.h
diff --git a/src/codec/SkBmpStandardCodec.h b/src/codec/SkBmpStandardCodec.h
index fcc246f3534d2b6fc50817ce3b82d029c245bb6d..bce8c4823cfd71c107013135cb44e569c92573c3 100644
--- a/src/codec/SkBmpStandardCodec.h
+++ b/src/codec/SkBmpStandardCodec.h
@@ -54,6 +54,8 @@ protected:
             const SkCodec::Options& options, SkPMColor inputColorPtr[],
             int* inputColorCount) override;
 
+    uint32_t onGetFillValue(const SkImageInfo& dstInfo) const override;
+
 private:
 
     /*
@@ -64,8 +66,8 @@ private:
 
     bool initializeSwizzler(const SkImageInfo& dstInfo, const Options& opts);
 
-    Result decodeRows(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes,
-                      const Options& opts) override;
+    uint32_t decodeRows(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes,
+            const Options& opts) override;
 
     Result decodeIcoMask(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes);