Limit QUIC's send algorithm max CWND by the peer's receive buffer and

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 1694da25415a1b5b1b198009716d601cb793f012..89f076877b28a3cd6efdf13b83fb5fc517bd93e2 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -172,6 +172,10 @@ void QuicSentPacketManager::SetFromConfig(const QuicConfig& config) {
     receive_buffer_bytes_ =
         max(kMinSocketReceiveBuffer,
             static_cast<QuicByteCount>(config.ReceivedSocketReceiveBuffer()));
+    if (FLAGS_quic_limit_max_cwnd_to_receive_buffer) {
+      send_algorithm_->SetMaxCongestionWindow(receive_buffer_bytes_ *
+                                              kUsableRecieveBufferFraction);
+    }
   }
   send_algorithm_->SetFromConfig(config, perspective_, using_pacing_);
 
@@ -791,8 +795,9 @@ QuicTime::Delta QuicSentPacketManager::TimeUntilSend(
   if (pending_timer_transmission_count_ > 0) {
     return QuicTime::Delta::Zero();
   }
-  if (unacked_packets_.bytes_in_flight() >=
-      kUsableRecieveBufferFraction * receive_buffer_bytes_) {
+  if (!FLAGS_quic_limit_max_cwnd_to_receive_buffer &&
+      unacked_packets_.bytes_in_flight() >=
+          kUsableRecieveBufferFraction * receive_buffer_bytes_) {
     return QuicTime::Delta::Infinite();
   }
   return send_algorithm_->TimeUntilSend(