take gr-context parameter to refEncoded, indicating a desire for only gpu-specific formats

src/ports/SkImageGenerator_skia.cpp

Index: src/ports/SkImageGenerator_skia.cpp
diff --git a/src/ports/SkImageGenerator_skia.cpp b/src/ports/SkImageGenerator_skia.cpp
index afcd4b4a924c48c990f6aece296e760419106338..8dbad555dd1d7f35ae7955c6187b34a97052f11e 100644
--- a/src/ports/SkImageGenerator_skia.cpp
+++ b/src/ports/SkImageGenerator_skia.cpp
@@ -43,7 +43,7 @@ public:
     {}
 
 protected:
-    SkData* onRefEncodedData() override {
+    SkData* onRefEncodedData(SK_REFENCODEDDATA_CTXPARAM) override {
         return SkRef(fData.get());
     }
     bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,