Add a kBYTE congestion option to QUIC to negotiate the TcpCubicBytesSender.

net/quic/quic_sent_packet_manager.cc

Index: net/quic/quic_sent_packet_manager.cc
diff --git a/net/quic/quic_sent_packet_manager.cc b/net/quic/quic_sent_packet_manager.cc
index 8a198dbb5cf7fddf3dfbd4a7f3b41f8b00a81d5a..3f9c222b0c8fae74ac69721c1b8f7cedd1297215 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -138,8 +138,17 @@ void QuicSentPacketManager::SetFromConfig(const QuicConfig& config) {
   }
   if (config.HasReceivedConnectionOptions() &&
       ContainsQuicTag(config.ReceivedConnectionOptions(), kRENO)) {
+    if (ContainsQuicTag(config.ReceivedConnectionOptions(), kBYTE)) {
+      send_algorithm_.reset(SendAlgorithmInterface::Create(
+          clock_, &rtt_stats_, kRenoBytes, stats_, initial_congestion_window_));
+    } else {
+      send_algorithm_.reset(SendAlgorithmInterface::Create(
+          clock_, &rtt_stats_, kReno, stats_, initial_congestion_window_));
+    }
+  } else if (config.HasReceivedConnectionOptions() &&
+             ContainsQuicTag(config.ReceivedConnectionOptions(), kBYTE)) {
     send_algorithm_.reset(SendAlgorithmInterface::Create(
-        clock_, &rtt_stats_, kReno, stats_, initial_congestion_window_));
+        clock_, &rtt_stats_, kCubicBytes, stats_, initial_congestion_window_));
   }
   EnablePacing();