Created HTML test file for tracking line number. Test currently fails.

servo · karenher · Dec 21, 2016 · Dec 24, 2016 · Dec 25, 2016 · Dec 25, 2016
commit 46e19125fb0a4af31e0300aaab43cfe7e9195043
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json

             "url": "/_mozilla/mozilla/trace_null.html"
           }
         ],
+        "mozilla/track_line.html": [
+          {
+            "path": "mozilla/track_line.html",
+            "url": "/_mozilla/mozilla/track_line.html"
+          }
+        ],
         "mozilla/union.html": [
           {
             "path": "mozilla/union.html",
diff --git a/tests/wpt/mozilla/tests/mozilla/track_line.html b/tests/wpt/mozilla/tests/mozilla/track_line.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<meta charset="utf-8">
+<title></title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+setup({allow_uncaught_exception:true});
+var t = async_test("error event has proper line number");
+window.addEventListener('error', t.step_func(function(e) {
+    assert_true(e instanceof ErrorEvent);
+    assert_equals(e.lineno, 16);
+    t.done();
+}), true);
+</script>
+<script>
+this_is_a_js_error
+</script>