Add logic for a client to enable pacing via config to the QUIC sent

net/quic/quic_sent_packet_manager.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/quic/quic_sent_packet_manager.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 96 matching lines @@
           QuicTime::Delta::FromSeconds(FLAGS_quic_recent_min_rtt_window_s));
     }
     send_algorithm_.reset(
         SendAlgorithmInterface::Create(clock_, &rtt_stats_, kBBR, stats_));
   }
   if (config.HasReceivedConnectionOptions() &&
       ContainsQuicTag(config.ReceivedConnectionOptions(), kRENO)) {
     send_algorithm_.reset(
         SendAlgorithmInterface::Create(clock_, &rtt_stats_, kReno, stats_));
   }
-  if (config.HasReceivedConnectionOptions() &&
-      ContainsQuicTag(config.ReceivedConnectionOptions(), kPACE)) {
+  if (is_server_) {
+    if (config.HasReceivedConnectionOptions() &&
+        ContainsQuicTag(config.ReceivedConnectionOptions(), kPACE)) {
+      EnablePacing();
+    }
+  } else if (config.HasSendConnectionOptions() &&
+             ContainsQuicTag(config.SendConnectionOptions(), kPACE)) {
     EnablePacing();
   }
   // TODO(ianswett): Remove the "HasReceivedLossDetection" branch once
   // the ConnectionOptions code is live everywhere.
   if ((config.HasReceivedLossDetection() &&
        config.ReceivedLossDetection() == kTIME) ||
       (config.HasReceivedConnectionOptions() &&
        ContainsQuicTag(config.ReceivedConnectionOptions(), kTIME))) {
     loss_algorithm_.reset(LossDetectionInterface::Create(kTime));
   }
@@ skipping 757 matching lines @@
 
   // Set up a pacing sender with a 5 millisecond alarm granularity.
   using_pacing_ = true;
   send_algorithm_.reset(
       new PacingSender(send_algorithm_.release(),
                        QuicTime::Delta::FromMilliseconds(5),
                        kInitialUnpacedBurst));
 }
 
 }  // namespace net