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-null.htm b/src/third_party/web_platform_tests/websockets/Close-null.htm
new file mode 100644
index 0000000..165fc2d
--- /dev/null
+++ b/src/third_party/web_platform_tests/websockets/Close-null.htm
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>W3C WebSocket API - Close WebSocket - Code is null</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("W3C WebSocket API - Create WebSocket - Close the Connection - close(null) - INVALID_ACCESS_ERR is thrown");
+
+        var wsocket = CreateWebSocket(false, false, false);
+        var isOpenCalled = false;
+
+        wsocket.addEventListener('open', test.step_func(function (evt) {
+            assert_throws("INVALID_ACCESS_ERR", function () { wsocket.close(null) });
+            test.done();
+        }), true);
+    </script>
+
+</body>
+</html>