[SVG2] Elements that don't render shouldn't contribute to ancestor bboxes.

LayoutTests/svg/custom/getBBox-perpendicular-polygon.svg

Index: LayoutTests/svg/custom/getBBox-perpendicular-polygon.svg
diff --git a/LayoutTests/svg/custom/getBBox-perpendicular-path.svg b/LayoutTests/svg/custom/getBBox-perpendicular-polygon.svg
similarity index 70%
copy from LayoutTests/svg/custom/getBBox-perpendicular-path.svg
copy to LayoutTests/svg/custom/getBBox-perpendicular-polygon.svg
index 8c5d5e8d08b729f2538e7a5989c07c4559044ddc..f57358d82a862f98e486bbeec00a43c5b10aa621 100644
--- a/LayoutTests/svg/custom/getBBox-perpendicular-path.svg
+++ b/LayoutTests/svg/custom/getBBox-perpendicular-polygon.svg
@@ -1,5 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!-- Test the bounding box calculated for two perpendicular lines of length 100px -->
+<!-- Test the bounding box calculated for two perpendicular lines of length 100px created with the polygon element -->
 <!-- If the bounding box is 100x100, we consider this test passing. -->
 <svg xmlns="http://www.w3.org/2000/svg" onload="init()">
   <script type="text/javascript">
@@ -19,8 +18,8 @@
   ]]>
   </script>
   <g id="shape">
-    <path stroke="#666666" stroke-width="2.0" stroke-linejoin="round" stroke-linecap="butt" d="M5 5L5 105" fill-rule="nonzero"></path>
-    <path stroke="#666666" stroke-width="2.0" stroke-linejoin="round" stroke-linecap="butt" d="M5 5L105 5" fill-rule="nonzero"></path>
+    <polygon stroke="#666666" stroke-width="2.0" stroke-linejoin="round" stroke-linecap="butt" points="5,5 5,105" fill-rule="nonzero" />
+    <polygon stroke="#666666" stroke-width="2.0" stroke-linejoin="round" stroke-linecap="butt" points="5,5 105,5" fill-rule="nonzero" />
   </g>
   <text id="text" x="50" y="50" />
 </svg>