Add ELEMENT_TYPE_WEBSOCKET to subresource filter

third_party/WebKit/LayoutTests/http/tests/websocket/subresource-filter-disallows.html

Index: third_party/WebKit/LayoutTests/http/tests/websocket/subresource-filter-disallows.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/websocket/subresource-filter-disallows.html b/third_party/WebKit/LayoutTests/http/tests/websocket/subresource-filter-disallows.html
new file mode 100644
index 0000000000000000000000000000000000000000..2d2c283646631771ba6e0f4fdaef8671545d9445
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/http/tests/websocket/subresource-filter-disallows.html
@@ -0,0 +1,18 @@
+<script src="../resources/testharness.js"></script>
+<script src="../resources/testharnessreport.js"></script>
+<script>
+if (window.testRunner)
+  testRunner.setDisallowedSubresourcePathSuffixes(["echo"]);
+
+async_test(t => {
+  let ws_allow = new WebSocket("ws://localhost:8880/pong?payload=Hello");
+  ws_allow.onopen = t.step_func_done();
+}, "Allow websocket connection without matching rule");
+
+async_test(t => {
+  let ws_disallow= new WebSocket("ws://localhost:8880/echo");
+  ws_disallow.onclose = t.step_func_done();
+  ws_disallow.onopen =
+      t.unreached_func("Should not open disallowed web socket connections");
+}, "Filter websocket connection successfully");
+</script>