Add WebSocket cookie tests.

net/websockets/websocket_test_util.cc

Index: net/websockets/websocket_test_util.cc
diff --git a/net/websockets/websocket_test_util.cc b/net/websockets/websocket_test_util.cc
index 6091c9e0be16a1a95d48e2c7cb7ba5f37b41eda7..5acfa25b474abfdd8cca264ed5de85eac8d0af0d 100644
--- a/net/websockets/websocket_test_util.cc
+++ b/net/websockets/websocket_test_util.cc
@@ -36,6 +36,16 @@ std::string WebSocketStandardRequest(const std::string& path,
                                      const std::string& host,
                                      const std::string& origin,
                                      const std::string& extra_headers) {
+  return WebSocketStandardRequestWithCookies(path, host, origin, "",
+                                             extra_headers);
+}
+
+std::string WebSocketStandardRequestWithCookies(
+    const std::string& path,
+    const std::string& host,
+    const std::string& origin,
+    const std::string& cookies,
+    const std::string& extra_headers) {
   // Unrelated changes in net/http may change the order and default-values of
   // HTTP headers, causing WebSocket tests to fail. It is safe to update this
   // string in that case.
@@ -51,10 +61,12 @@ std::string WebSocketStandardRequest(const std::string& path,
       "User-Agent:\r\n"
       "Accept-Encoding: gzip, deflate\r\n"
       "Accept-Language: en-us,fr\r\n"
+      "%s"
       "Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==\r\n"
       "Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits\r\n"
       "%s\r\n",
-      path.c_str(), host.c_str(), origin.c_str(), extra_headers.c_str());
+      path.c_str(), host.c_str(), origin.c_str(), cookies.c_str(),
+      extra_headers.c_str());
 }
 
 std::string WebSocketStandardResponse(const std::string& extra_headers) {