Import Cobalt 19.master.0.203780 Includes the following patches: https://cobalt-review.googlesource.com/c/cobalt/+/5210 by errong.leng@samsung.com https://cobalt-review.googlesource.com/c/cobalt/+/5270 by linus.wang@samsung.com

diff --git a/src/third_party/web_platform_tests/websockets/Close-undefined.htm b/src/third_party/web_platform_tests/websockets/Close-undefined.htm
new file mode 100644
index 0000000..3de1656
--- /dev/null
+++ b/src/third_party/web_platform_tests/websockets/Close-undefined.htm

@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>W3C WebSocket API - Close WebSocket - Code is undefined</title>
+    <script type="text/javascript" src="/resources/testharness.js"></script>
+    <script type="text/javascript" src="/resources/testharnessreport.js"></script>
+    <script type="text/javascript" src="websocket.js?pipe=sub"></script>
+</head>
+<body>
+    <div id="log"></div>
+    <script type="text/javascript">
+
+        var test = async_test();
+
+        var wsocket = CreateWebSocket(false, false, false);
+        var isOpenCalled = false;
+
+        wsocket.addEventListener('open', test.step_func(function (evt) {
+            wsocket.close(undefined);
+            test.done();
+        }), true);
+    </script>
+
+</body>
+</html>