Must pass filtering to picture shader

Change-Id: I820867df80daa1594d6202cad5e8e95c060293fe
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/386838
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
diff --git a/gm/bug6643.cpp b/gm/bug6643.cpp
index 42debb5..ceebdc1 100644
--- a/gm/bug6643.cpp
+++ b/gm/bug6643.cpp
@@ -30,7 +30,8 @@
     recorder.beginRecording(200, 200)->drawPaint(p);
 
     p.setShader(recorder.finishRecordingAsPicture()->makeShader(
-                                            SkTileMode::kRepeat, SkTileMode::kRepeat));
+                                            SkTileMode::kRepeat, SkTileMode::kRepeat,
+                                            SkFilterMode::kNearest, nullptr, nullptr));
     canvas->drawColor(SK_ColorWHITE);
     canvas->drawPaint(p);
 }