WebSocket header continuations test case.

The old WebSocket implementation did not support header
continuations. The new implementation does. Add a regression test so
that we do not regress the fix accidentally.

TEST=net_unittests
BUG=169448

Review URL: https://codereview.chromium.org/1005113002

Cr-Commit-Position: refs/heads/master@{#321326}

net/data/websocket/header-continuation_wsh.py

+# Copyright 2015 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.
+#
+# The purpose of this test is to verify that WebSocket supports header
+# continuations, as deprecated in RFC7230 section 3.2.4.
+# It is used by test case WebSocketEndToEndTest.HeaderContinuations.
+
+from mod_pywebsocket import handshake
+from mod_pywebsocket.handshake.hybi import compute_accept
+
+
+def web_socket_do_extra_handshake(request):
+  accept = compute_accept(request.headers_in['Sec-WebSocket-Key'])[0]
+  message = ('HTTP/1.1 101 Switching Protocols\r\n'
+             'Upgrade: websocket\r\n'
+             'Connection: Upgrade\r\n'
+             'Sec-WebSocket-Accept: %s\r\n'
+             'Sec-WebSocket-Extensions: permessage-deflate;\r\n'
+             '  server_max_window_bits=10\r\n'
+             '\r\n' % accept)
+  request.connection.write(message)
+  # Prevent pywebsocket from sending its own handshake message.
+  raise handshake.AbortedByUserException('Close the connection')
+
+
+def web_socket_transfer_data(request):
+  pass

net/websockets/websocket_end_to_end_test.cc

@@ -470,6 +470,24 @@ TEST_F(WebSocketEndToEndTest, DISABLED_ON_ANDROID(TrailingWhitespace)) {
   EXPECT_EQ("sip", event_interface_->selected_subprotocol());
 }
 
+// This is a regression test for crbug.com/169448 "WebSockets should support
+// header continuations"
+// TODO(ricea): HTTP continuation headers have been deprecated by RFC7230.  If
+// support for continuation headers is removed from Chrome, then this test will
+// break and should be removed.
+TEST_F(WebSocketEndToEndTest, DISABLED_ON_ANDROID(HeaderContinuations)) {
+  SpawnedTestServer ws_server(SpawnedTestServer::TYPE_WS,
+                              SpawnedTestServer::kLocalhost,
+                              GetWebSocketTestDataDirectory());
+  ASSERT_TRUE(ws_server.Start());
+
+  GURL ws_url = ws_server.GetURL("header-continuation");
+
+  EXPECT_TRUE(ConnectAndWait(ws_url));
+  EXPECT_EQ("permessage-deflate; server_max_window_bits=10",
+            event_interface_->extensions());
+}
+
 }  // namespace
 
 }  // namespace net