Stop wrapping images backed by generators as bitmaps in SkGpuDevice (except when tiling)

src/image/SkImage_Generator.cpp

Index: src/image/SkImage_Generator.cpp
diff --git a/src/image/SkImage_Generator.cpp b/src/image/SkImage_Generator.cpp
index fbde92da663f8fb51d61f36b43103bca6df36c6d..6671dcd3b142d9d606e6d234c09dc9b9d063e5b7 100644
--- a/src/image/SkImage_Generator.cpp
+++ b/src/image/SkImage_Generator.cpp
@@ -23,6 +23,7 @@ public:
 
     bool onReadPixels(const SkImageInfo&, void*, size_t, int srcX, int srcY, CachingHint) const override;
     const void* onPeekPixels(SkImageInfo*, size_t* /*rowBytes*/) const override;
+    SkImageCacherator* peekCacherator() const override { return fCache; }
     SkData* onRefEncoded() const override;
     bool isOpaque() const override { return fCache->info().isOpaque(); }
     SkImage* onNewSubset(const SkIRect&) const override;