[WebSocket] Add close-before-open layout test for workers

LayoutTests/http/tests/websocket/workers/resources/close-before-open.js

Index: LayoutTests/http/tests/websocket/workers/resources/close-before-open.js
diff --git a/LayoutTests/http/tests/websocket/workers/resources/close-before-open.js b/LayoutTests/http/tests/websocket/workers/resources/close-before-open.js
new file mode 100644
index 0000000000000000000000000000000000000000..44bb8a5a2420de67314184b33dcc0cd84f748217
--- /dev/null
+++ b/LayoutTests/http/tests/websocket/workers/resources/close-before-open.js
@@ -0,0 +1,18 @@
+var ws = new WebSocket("ws://127.0.0.1:8880/echo");
+var errorCalled = false;
+ws.onopen = function () {
+    postMessage("FAIL: Unexpected open event on ws");
+};
+ws.onmessage = function () {
+    postMessage("FAIL: Unexpected message event on ws");
+};
+ws.onerror = function () {
+    errorCalled = true;
+};
+ws.onclose = function () {
+    if (errorCalled)
+        postMessage("DONE");
+    else
+        postMessage("FAIL: Error event was not dispatched");
+};
+ws.close();