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

src/ports/SkImageGenerator_skia.cpp

 /*
  * Copyright 2015 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkData.h"
 #include "SkImageDecoder.h"
 #include "SkImageGenerator.h"
@@ skipping 25 matching lines @@
     const SkImageInfo               fInfo;
     SkAutoTDelete<SkImageDecoder>   fDecoder;
     SkAutoTUnref<SkData>            fData;
 
 public:
     SkImageDecoderGenerator(const SkImageInfo& info, SkImageDecoder* decoder, SkData* data)
         : INHERITED(info), fInfo(info), fDecoder(decoder), fData(SkRef(data))
     {}
 
 protected:
-    SkData* onRefEncodedData() override {
+    SkData* onRefEncodedData(SK_REFENCODEDDATA_CTXPARAM) override {
         return SkRef(fData.get());
     }
     bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
                      SkPMColor ctableEntries[], int* ctableCount) override {
         SkMemoryStream stream(fData->data(), fData->size(), false);
         SkAutoTUnref<BareMemoryAllocator> allocator(
                 new BareMemoryAllocator(info, pixels, rowBytes));
         fDecoder->setAllocator(allocator);
         fDecoder->setRequireUnpremultipliedColors(kUnpremul_SkAlphaType == info.alphaType());
 
@@ skipping 39 matching lines @@
 
     SkBitmap bm;
     stream.rewind();
     if (!decoder->decode(&stream, &bm, kUnknown_SkColorType, SkImageDecoder::kDecodeBounds_Mode)) {
         delete decoder;
         return nullptr;
     }
 
     return new SkImageDecoderGenerator(bm.info(), decoder, data);
 }