Limit QUIC's Cubic CWND increases to 1/2 the bytes acked when in

net/quic/core/congestion_control/cubic.h

Index: net/quic/core/congestion_control/cubic.h
diff --git a/net/quic/core/congestion_control/cubic.h b/net/quic/core/congestion_control/cubic.h
index c9de98246ec08c13a02a082d38d928b5b12a0df2..30657e57c9d6b58d4e9943d6f733dd9399adbe2c 100644
--- a/net/quic/core/congestion_control/cubic.h
+++ b/net/quic/core/congestion_control/cubic.h
@@ -77,9 +77,14 @@ class NET_EXPORT_PRIVATE Cubic {
   // applied to this value if the new value is below our latest value.
   QuicPacketCount last_max_congestion_window_;
 
-  // Number of acked packets since the cycle started (epoch).
+  // Number of acked packets accumulated to increase the CWND via Reno
+  // 'tcp friendly' mode.
   QuicPacketCount acked_packets_count_;
 
+  // Number of acked packets since the cycle started (epoch).
+  // Used to limit CWND increases to 1/2 the number of acked packets.
+  QuicPacketCount epoch_packets_count_;
+
   // TCP Reno equivalent congestion window in packets.
   QuicPacketCount estimated_tcp_congestion_window_;