select.add() should support optgroup adding and before index

LayoutTests/fast/forms/select/select-add-expected.txt

Index: LayoutTests/fast/forms/select/select-add-expected.txt
diff --git a/LayoutTests/fast/forms/select/select-add-expected.txt b/LayoutTests/fast/forms/select/select-add-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..79c2c68730bf307e5cba604b51bf1b53aea3de69
--- /dev/null
+++ b/LayoutTests/fast/forms/select/select-add-expected.txt
@@ -0,0 +1,55 @@
+Test select.add() method
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Test select
+PASS select.length is 0
+PASS select.length is 1
+PASS select.options[0].value is "1"
+PASS select.length is 2
+PASS select.options[0].value is "2"
+PASS select.options[1].value is "1"
+PASS select.length is 3
+PASS select.options[0].value is "2"
+PASS select.options[1].value is "3"
+PASS select.options[2].value is "1"
+PASS select.length is 4
+PASS select.options[0].value is "2"
+PASS select.options[1].value is "3"
+PASS select.options[2].value is "4"
+PASS select.options[3].value is "1"
+PASS select.length is 6
+PASS select.options[0].value is "2"
+PASS select.options[1].value is "3"
+PASS select.options[2].value is "4"
+PASS select.options[3].value is "5"
+PASS select.options[4].value is "6"
+PASS select.options[5].value is "1"
+Test select multiple
+PASS select.length is 0
+PASS select.length is 1
+PASS select.options[0].value is "1"
+PASS select.length is 2
+PASS select.options[0].value is "2"
+PASS select.options[1].value is "1"
+PASS select.length is 3
+PASS select.options[0].value is "2"
+PASS select.options[1].value is "3"
+PASS select.options[2].value is "1"
+PASS select.length is 4
+PASS select.options[0].value is "2"
+PASS select.options[1].value is "3"
+PASS select.options[2].value is "4"
+PASS select.options[3].value is "1"
+PASS select.length is 6
+PASS select.options[0].value is "2"
+PASS select.options[1].value is "3"
+PASS select.options[2].value is "4"
+PASS select.options[3].value is "5"
+PASS select.options[4].value is "6"
+PASS select.options[5].value is "1"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+