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

net/quic/congestion_control/tcp_cubic_sender.cc

Index: net/quic/congestion_control/tcp_cubic_sender.cc
diff --git a/net/quic/congestion_control/tcp_cubic_sender.cc b/net/quic/congestion_control/tcp_cubic_sender.cc
index 2a381c7aadeb22ddc05b7e5f7549fb272db0dab9..5a1a8f20ada944fee6e662877126c558f7b09c8d 100644
--- a/net/quic/congestion_control/tcp_cubic_sender.cc
+++ b/net/quic/congestion_control/tcp_cubic_sender.cc
@@ -108,6 +108,11 @@ void TcpCubicSender::SetNumEmulatedConnections(int num_connections) {
   cubic_.SetNumConnections(num_connections_);
 }
 
+void TcpCubicSender::SetMaxCongestionWindow(
+    QuicByteCount max_congestion_window) {
+  max_tcp_congestion_window_ = max_congestion_window / kMaxPacketSize;
+}
+
 float TcpCubicSender::RenoBeta() const {
   // kNConnectionBeta is the backoff factor after loss for our N-connection
   // emulation, which emulates the effective backoff of an ensemble of N