move setshader to sk_sp

gm/image.cpp

Index: gm/image.cpp
diff --git a/gm/image.cpp b/gm/image.cpp
index 8cc3023edfe5d86cabad573b2895559c92284030..c86be079d95727e879d1e04a3409017f1e6ba761 100644
--- a/gm/image.cpp
+++ b/gm/image.cpp
@@ -76,8 +76,8 @@ static void test_surface(SkCanvas* canvas, SkSurface* surf, bool usePaint) {
 //    paint.setFilterBitmap(true);
 //    paint.setAlpha(0x80);
 
-    canvas->drawImage(imgR.get(), 0, 0, usePaint ? &paint : nullptr);
-    canvas->drawImage(imgG.get(), 0, 80, usePaint ? &paint : nullptr);
+    canvas->drawImage(imgR, 0, 0, usePaint ? &paint : nullptr);
+    canvas->drawImage(imgG, 0, 80, usePaint ? &paint : nullptr);
     surf->draw(canvas, 0, 160, usePaint ? &paint : nullptr);
 
     SkRect src1, src2, src3;
@@ -92,10 +92,10 @@ static void test_surface(SkCanvas* canvas, SkSurface* surf, bool usePaint) {
     dst3.set(0, 400, 65, 465);
     dst4.set(0, 480, 65, 545);
 
-    canvas->drawImageRect(imgR.get(), src1, dst1, usePaint ? &paint : nullptr);
-    canvas->drawImageRect(imgG.get(), src2, dst2, usePaint ? &paint : nullptr);
-    canvas->drawImageRect(imgR.get(), src3, dst3, usePaint ? &paint : nullptr);
-    canvas->drawImageRect(imgG.get(), dst4, usePaint ? &paint : nullptr);
+    canvas->drawImageRect(imgR, src1, dst1, usePaint ? &paint : nullptr);
+    canvas->drawImageRect(imgG, src2, dst2, usePaint ? &paint : nullptr);
+    canvas->drawImageRect(imgR, src3, dst3, usePaint ? &paint : nullptr);
+    canvas->drawImageRect(imgG, dst4, usePaint ? &paint : nullptr);
 }
 
 class ImageGM : public skiagm::GM {