hide legacy scalePixels and makeShader

Change-Id: Idae1e44aa0417adb943fd20112fb4f1fa81167f2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/337719
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/docs/examples/Image_scalePixels.cpp b/docs/examples/Image_scalePixels.cpp
index 9a595ac..ab38ecd 100644
--- a/docs/examples/Image_scalePixels.cpp
+++ b/docs/examples/Image_scalePixels.cpp
@@ -15,7 +15,7 @@
     SkFilterQuality qualities[] = { kNone_SkFilterQuality, kLow_SkFilterQuality,
                      kMedium_SkFilterQuality, kHigh_SkFilterQuality };
     for (unsigned index = 0; index < SK_ARRAY_COUNT(qualities); ++index) {
-        image->scalePixels(pixmap, qualities[index]);
+        image->scalePixels(pixmap, SkSamplingOptions(qualities[index]));
         sk_sp<SkImage> filtered = SkImage::MakeFromRaster(pixmap, nullptr, nullptr);
         canvas->drawImage(filtered, 16 * index, 0);
     }