Add LayoutTest for AX Role of dl element

LayoutTests/accessibility/dl-role-expected.txt

Index: LayoutTests/accessibility/dl-role-expected.txt
diff --git a/LayoutTests/fast/canvas/canvas-frameless-document-text-expected.txt b/LayoutTests/accessibility/dl-role-expected.txt
similarity index 51%
copy from LayoutTests/fast/canvas/canvas-frameless-document-text-expected.txt
copy to LayoutTests/accessibility/dl-role-expected.txt
index 5c3f90595fbfa24d7877d0a72413c999e3c985b1..d5096a8cb0ab871278232e494dbed2270ee74cac 100644
--- a/LayoutTests/fast/canvas/canvas-frameless-document-text-expected.txt
+++ b/LayoutTests/accessibility/dl-role-expected.txt
@@ -1,9 +1,13 @@
-This verifies that the browser does not crash when drawing text to a canvas in a frame-less document.
+This tests that AXRole for dl element is AXDescriptionList.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
+PASS dlElement.role is 'AXRole: AXDescriptionList'
+PASS dtElement.role is 'AXRole: AXDescriptionListTerm'
+PASS ddElement.role is 'AXRole: AXDescriptionListDetail'
 PASS successfullyParsed is true
 
 TEST COMPLETE
-
+term
+definition