Enable websocket filtering via SubresourceFilter

chrome/test/data/subresource_filter/websocket_connection.js

Index: chrome/test/data/subresource_filter/websocket_connection.js
diff --git a/chrome/test/data/subresource_filter/websocket_connection.js b/chrome/test/data/subresource_filter/websocket_connection.js
new file mode 100644
index 0000000000000000000000000000000000000000..4d5db4cb67fb48281f0c2b8abd3eb0bae616ba03
--- /dev/null
+++ b/chrome/test/data/subresource_filter/websocket_connection.js
@@ -0,0 +1,32 @@
+// Note: This JS can run either in a worker or as a script in the main document
+// context.
+function connectWebSocket(url, inWorker) {
+  function messageMainContext(data) {
+    if (inWorker)
+      self.postMessage(data);
+    else
+      self.postMessage(data, location);
+  }
+  var ws = new WebSocket(url);
+
+  ws.addEventListener('open', function() {
+    ws.send('hello world');
+  });
+
+  ws.addEventListener('close', function() {
+    messageMainContext("onclose");
+  });
+
+  ws.addEventListener('message', function() {
+    messageMainContext('onmessage');
+  });
+}
+
+self.addEventListener('message', function(e) {
+  // Will only receive a message with a URL in it if this JS is executing in a
+  // worker.
+  if (e.data.url) {
+    connectWebSocket(e.data.url, true /* inWorker */);
+  }
+});
+