Use sk_sp text blob APIs

SkTextBlobBuilder::build()      -> make()
SkAutoTUnref<const SkTextBlob>  -> sk_sp<SkTextBlob>
drawTextBlob(const SkTextBlob*) -> drawTextBlob(const sk_sp<SkTextBlob>&)

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2335493005

Review-Url: https://codereview.chromium.org/2335493005
diff --git a/tools/debugger/SkDrawCommand.h b/tools/debugger/SkDrawCommand.h
index 2e5f9c6..07dd477 100644
--- a/tools/debugger/SkDrawCommand.h
+++ b/tools/debugger/SkDrawCommand.h
@@ -625,7 +625,7 @@
 
 class SkDrawTextBlobCommand : public SkDrawCommand {
 public:
-    SkDrawTextBlobCommand(const SkTextBlob* blob, SkScalar x, SkScalar y, const SkPaint& paint);
+    SkDrawTextBlobCommand(sk_sp<SkTextBlob> blob, SkScalar x, SkScalar y, const SkPaint& paint);
 
     void execute(SkCanvas* canvas) const override;
     bool render(SkCanvas* canvas) const override;
@@ -633,10 +633,10 @@
     static SkDrawTextBlobCommand* fromJSON(Json::Value& command, UrlDataManager& urlDataManager);
 
 private:
-    SkAutoTUnref<const SkTextBlob> fBlob;
-    SkScalar                       fXPos;
-    SkScalar                       fYPos;
-    SkPaint                        fPaint;
+    sk_sp<SkTextBlob> fBlob;
+    SkScalar          fXPos;
+    SkScalar          fYPos;
+    SkPaint           fPaint;
 
     typedef SkDrawCommand INHERITED;
 };