Add WebSocketStream factory function

net/websockets/websocket_stream.cc

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/websockets/websocket_stream.h"
+
+#include "base/logging.h"
+
+namespace net {
+
+WebSocketStream::WebSocketStream() : WebSocketStreamBase() {}
+WebSocketStream::~WebSocketStream() {}
+
+// Placeholder until the real implementation is ready.
+void WebSocketStream::CreateAndConnectStream(
+    const GURL& socket_url,
+    const std::vector<std::string>& requested_protocols,
+    const GURL& origin,
+    URLRequestContext* url_request_context,
+    const SuccessCallback& on_success,
+    const FailureCallback& on_failure) {
+  NOTIMPLEMENTED();
+}
+
+WebSocketStream* WebSocketStream::AsWebSocketStream() { return this; }
+
+}  // namespace net