[sksg] Expose SkFont::Edging in TextNode

(instead of SkPaint flags)

TBR=
Change-Id: I31566f29d7922b26898234c357d8d249ebc1e094
Reviewed-on: https://skia-review.googlesource.com/c/172504
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
diff --git a/tools/viewer/SlideDir.cpp b/tools/viewer/SlideDir.cpp
index a776bbd..09ecd7c 100644
--- a/tools/viewer/SlideDir.cpp
+++ b/tools/viewer/SlideDir.cpp
@@ -260,7 +260,7 @@
                                          const SkMatrix& dstXform) {
     const auto size = kLabelSize / std::sqrt(dstXform.getScaleX() * dstXform.getScaleY());
     auto text = sksg::Text::Make(nullptr, txt);
-    text->setFlags(SkPaint::kAntiAlias_Flag);
+    text->setEdging(SkFont::Edging::kAntiAlias);
     text->setSize(size);
     text->setAlign(SkTextUtils::kCenter_Align);
     text->setPosition(pos + SkPoint::Make(0, size));