Implement Fill() for incomplete decodes to RGBA_F16

src/codec/SkSampledCodec.cpp

Index: src/codec/SkSampledCodec.cpp
diff --git a/src/codec/SkSampledCodec.cpp b/src/codec/SkSampledCodec.cpp
index 49c939c1f887c500f8795173a031dc2c996b36eb..47f99f796633203ec242ace5d7b833f8438634b6 100644
--- a/src/codec/SkSampledCodec.cpp
+++ b/src/codec/SkSampledCodec.cpp
@@ -253,7 +253,7 @@ SkCodec::Result SkSampledCodec::sampledDecode(const SkImageInfo& info, void* pix
 
             // We handle filling uninitialized memory here instead of using this->codec().
             // this->codec() does not know that we are sampling.
-            const uint32_t fillValue = this->codec()->getFillValue(info.colorType());
+            const uint64_t fillValue = this->codec()->getFillValue(info);
             const SkImageInfo fillInfo = info.makeWH(info.width(), 1);
             for (; y < nativeSize.height(); y++) {
                 int srcY = this->codec()->outputScanline(y);