[SVGDom] <polygon> & <polyline> support

R=robertphillips@google.com,stephana@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2235273003

Review-Url: https://codereview.chromium.org/2235273003
diff --git a/experimental/svg/model/SkSVGNode.h b/experimental/svg/model/SkSVGNode.h
index 38a17d8..1e5c3be 100644
--- a/experimental/svg/model/SkSVGNode.h
+++ b/experimental/svg/model/SkSVGNode.h
@@ -19,6 +19,8 @@
 enum class SkSVGTag {
     kG,
     kPath,
+    kPolygon,
+    kPolyline,
     kRect,
     kSvg
 };