[SVGDom] Parse style attributes

Dispatch style-encoded (style="foo: bar; ...") attributes via normal
attribute setters.

R=reed@google.com,robertphillips@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2193663002

Review-Url: https://codereview.chromium.org/2193663002
diff --git a/experimental/svg/model/SkSVGNode.h b/experimental/svg/model/SkSVGNode.h
index de18014..407e69a 100644
--- a/experimental/svg/model/SkSVGNode.h
+++ b/experimental/svg/model/SkSVGNode.h
@@ -17,9 +17,9 @@
 class SkSVGValue;
 
 enum class SkSVGTag {
-    g,
-    path,
-    svg
+    kG,
+    kPath,
+    kSvg
 };
 
 class SkSVGNode : public SkRefCnt {