SkImage now has makeShader to return sk_sp

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1785473002

Review URL: https://codereview.chromium.org/1785473002
diff --git a/src/image/SkImageShader.h b/src/image/SkImageShader.h
index 07b938d..f466e61 100644
--- a/src/image/SkImageShader.h
+++ b/src/image/SkImageShader.h
@@ -13,7 +13,8 @@
 
 class SkImageShader : public SkShader {
 public:
-    static SkShader* Create(const SkImage*, TileMode tx, TileMode ty, const SkMatrix* localMatrix);
+    static sk_sp<SkShader> Make(const SkImage*, TileMode tx, TileMode ty,
+                                const SkMatrix* localMatrix);
 
     bool isOpaque() const override;