use Make instead of Create to return a shared shader

tools/sk_tool_utils.cpp

Index: tools/sk_tool_utils.cpp
diff --git a/tools/sk_tool_utils.cpp b/tools/sk_tool_utils.cpp
index e2bc0fc42cfb17e284335972234d0c41a043eb18..10e5c305c3c35709f4ea3bb9a083a6c18799674e 100644
--- a/tools/sk_tool_utils.cpp
+++ b/tools/sk_tool_utils.cpp
@@ -178,13 +178,13 @@ void write_pixels(SkCanvas* canvas, const SkBitmap& bitmap, int x, int y,
     canvas->writePixels(info, tmp.getPixels(), tmp.rowBytes(), x, y);
 }
 
-SkShader* create_checkerboard_shader(SkColor c1, SkColor c2, int size) {
+sk_sp<SkShader> create_checkerboard_shader(SkColor c1, SkColor c2, int size) {
     SkBitmap bm;
     bm.allocN32Pixels(2 * size, 2 * size);
     bm.eraseColor(c1);
     bm.eraseArea(SkIRect::MakeLTRB(0, 0, size, size), c2);
     bm.eraseArea(SkIRect::MakeLTRB(size, size, 2 * size, 2 * size), c2);
-    return SkShader::CreateBitmapShader(
+    return SkShader::MakeBitmapShader(
             bm, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
 }
 
@@ -199,7 +199,7 @@ SkBitmap create_checkerboard_bitmap(int w, int h, SkColor c1, SkColor c2, int ch
 
 void draw_checkerboard(SkCanvas* canvas, SkColor c1, SkColor c2, int size) {
     SkPaint paint;
-    paint.setShader(create_checkerboard_shader(c1, c2, size))->unref();
+    paint.setShader(create_checkerboard_shader(c1, c2, size));
     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
     canvas->drawPaint(paint);
 }