Retry upon 421 status code without IP pooling.

net/http/bidirectional_stream.cc

 // 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.
 
 #include "net/http/bidirectional_stream.h"
 
 #include <memory>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 105 matching lines @@
     return;
   }
 
   HttpRequestInfo http_request_info;
   http_request_info.url = request_info_->url;
   http_request_info.method = request_info_->method;
   http_request_info.extra_headers = request_info_->extra_headers;
   stream_request_.reset(
       session->http_stream_factory()->RequestBidirectionalStreamImpl(
           http_request_info, request_info_->priority, server_ssl_config,
-          server_ssl_config, this, net_log_));
+          server_ssl_config, this,
+          /* enable_ip_based_pooling = */ true, net_log_));
   // Check that this call cannot fail to set a non-NULL |stream_request_|.
   DCHECK(stream_request_);
   // Check that HttpStreamFactory does not invoke OnBidirectionalStreamImplReady
   // synchronously.
   DCHECK(!stream_impl_);
 }
 
 BidirectionalStream::~BidirectionalStream() {
   UpdateHistograms();
   if (net_log_.IsCapturing()) {
@@ skipping 303 matching lines @@
         "Net.BidirectionalStream.TimeToSendEnd.QUIC",
         load_timing_info_.send_end - load_timing_info_.request_start);
     UMA_HISTOGRAM_COUNTS("Net.BidirectionalStream.ReceivedBytes.QUIC",
                          stream_impl_->GetTotalReceivedBytes());
     UMA_HISTOGRAM_COUNTS("Net.BidirectionalStream.SentBytes.QUIC",
                          stream_impl_->GetTotalSentBytes());
   }
 }
 
 }  // namespace net