record drawfilters

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2303033002

Review-Url: https://codereview.chromium.org/2303033002
diff --git a/src/core/SkLiteDL.h b/src/core/SkLiteDL.h
index 1549576..9dd1568 100644
--- a/src/core/SkLiteDL.h
+++ b/src/core/SkLiteDL.h
@@ -23,6 +23,10 @@
     void makeThreadsafe();
     bool empty() const { return fUsed == 0; }
 
+#ifdef SK_SUPPORT_LEGACY_DRAWFILTER
+    void setDrawFilter(SkDrawFilter*);
+#endif
+
     void save();
     void saveLayer(const SkRect*, const SkPaint*, const SkImageFilter*, SkCanvas::SaveLayerFlags);
     void restore();