Add tests for SVGPathElement.get{PathSeg,Point}AtLength wrt non-finiteness

LayoutTests/svg/dynamic-updates/SVGPathElement-valid-arguments.html

Index: LayoutTests/svg/dynamic-updates/SVGPathElement-valid-arguments.html
diff --git a/LayoutTests/svg/dynamic-updates/SVGPathElement-valid-arguments.html b/LayoutTests/svg/dynamic-updates/SVGPathElement-valid-arguments.html
index b298d5614b203848ba307be4996ca374a911f518..fc7a9f6733990e7356ed686d9c57272607d7e8ba 100644
--- a/LayoutTests/svg/dynamic-updates/SVGPathElement-valid-arguments.html
+++ b/LayoutTests/svg/dynamic-updates/SVGPathElement-valid-arguments.html
@@ -6,10 +6,18 @@
       var pathElement = document.createElementNS("http://www.w3.org/2000/svg","path");
 
       shouldThrow('pathElement.getPointAtLength()',
-      	'"TypeError: Failed to execute \'getPointAtLength\' on \'SVGPathElement\': 1 argument required, but only 0 present."');
+        '"TypeError: Failed to execute \'getPointAtLength\' on \'SVGPathElement\': 1 argument required, but only 0 present."');
+      shouldThrow('pathElement.getPointAtLength(NaN)',
+        '"TypeError: Failed to execute \'getPointAtLength\' on \'SVGPathElement\': The provided float value is non-finite."');
+      shouldThrow('pathElement.getPointAtLength(Infinity)',
+        '"TypeError: Failed to execute \'getPointAtLength\' on \'SVGPathElement\': The provided float value is non-finite."');
 
       shouldThrow('pathElement.getPathSegAtLength()',
       	'"TypeError: Failed to execute \'getPathSegAtLength\' on \'SVGPathElement\': 1 argument required, but only 0 present."');
+      shouldThrow('pathElement.getPathSegAtLength(NaN)',
+        '"TypeError: Failed to execute \'getPathSegAtLength\' on \'SVGPathElement\': The provided float value is non-finite."');
+      shouldThrow('pathElement.getPathSegAtLength(Infinity)',
+        '"TypeError: Failed to execute \'getPathSegAtLength\' on \'SVGPathElement\': The provided float value is non-finite."');
 
       shouldThrow('pathElement.createSVGPathSegMovetoAbs(0.0)',
       	'"TypeError: Failed to execute \'createSVGPathSegMovetoAbs\' on \'SVGPathElement\': 2 arguments required, but only 1 present."');
@@ -68,4 +76,4 @@
 	<p id="description">Test that correct exceptions are thrown from SVGPathElement methods.</p>
 	<div id="console"></div>
   </body>
-</html>
+</html>