Use SkImageCacherator in SkImages

src/image/SkImage_Gpu.h

Index: src/image/SkImage_Gpu.h
diff --git a/src/image/SkImage_Gpu.h b/src/image/SkImage_Gpu.h
index 9481690714c9619b6b17369b549f6c1b580f21c5..d168fb6853428898f6b3ccef878e994af89b4a52 100644
--- a/src/image/SkImage_Gpu.h
+++ b/src/image/SkImage_Gpu.h
@@ -37,7 +37,9 @@ public:
     }
 
     bool getROPixels(SkBitmap*) const override;
-    GrTexture* getTexture() const override { return fTexture; }
+    GrTexture* asTextureRef(GrContext* ctx, SkImageUsageType usage) const override;
+
+    GrTexture* peekTexture() const override { return fTexture; }
     SkShader* onNewShader(SkShader::TileMode,
                           SkShader::TileMode,
                           const SkMatrix* localMatrix) const override;