Add tests for |undefined| and |null| in SVG interfaces

Source/core/svg/SVGTextContentElement.idl

Index: Source/core/svg/SVGTextContentElement.idl
diff --git a/Source/core/svg/SVGTextContentElement.idl b/Source/core/svg/SVGTextContentElement.idl
index 706e6a8155df371b015b336ef6145f8a9da1fa7e..f16b1f9f2ef7514c442479b1023a63cad2ece3cf 100644
--- a/Source/core/svg/SVGTextContentElement.idl
+++ b/Source/core/svg/SVGTextContentElement.idl
@@ -23,7 +23,9 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-interface SVGTextContentElement : SVGGraphicsElement {
+[
+    StrictTypeChecking,
+] interface SVGTextContentElement : SVGGraphicsElement {
     // lengthAdjust Types
     const unsigned short LENGTHADJUST_UNKNOWN          = 0;
     const unsigned short LENGTHADJUST_SPACING          = 1;
@@ -39,7 +41,7 @@ interface SVGTextContentElement : SVGGraphicsElement {
     [RaisesException] SVGPoint getEndPositionOfChar(unsigned long offset);
     [RaisesException] SVGRect getExtentOfChar(unsigned long offset);
     [RaisesException] float getRotationOfChar(unsigned long offset);
-    [StrictTypeChecking, RaisesException] long getCharNumAtPosition(SVGPoint point);
+    [RaisesException] long getCharNumAtPosition(SVGPoint point);
     [RaisesException] void selectSubString(unsigned long offset, unsigned long length);
 };