start on apply gamma cleanup

src/image/SkImage_Gpu.cpp

Index: src/image/SkImage_Gpu.cpp
diff --git a/src/image/SkImage_Gpu.cpp b/src/image/SkImage_Gpu.cpp
index c331a295ce6d44031f1c0fb480aa3335b5a8eed2..25222fcc17547712caa45e4dde7c4a2b8738abd9 100644
--- a/src/image/SkImage_Gpu.cpp
+++ b/src/image/SkImage_Gpu.cpp
@@ -83,6 +83,9 @@ bool SkImage_Gpu::getROPixels(SkBitmap* dst, CachingHint chint) const {
 
 GrTexture* SkImage_Gpu::asTextureRef(GrContext* ctx, const GrTextureParams& params,
                                      SkSourceGammaTreatment gammaTreatment) const {
+    if (fTexture->getContext() != ctx) {
+        return nullptr;
+    }
     return GrImageTextureAdjuster(as_IB(this)).refTextureSafeForParams(params, gammaTreatment,
                                                                        nullptr);
 }