Implement a QUIC No PRR connection option, NPRR. Protected by FLAGS_quic_allow_no_prr

net/quic/congestion_control/tcp_cubic_sender_base.h

Index: net/quic/congestion_control/tcp_cubic_sender_base.h
diff --git a/net/quic/congestion_control/tcp_cubic_sender_base.h b/net/quic/congestion_control/tcp_cubic_sender_base.h
index 5149818f9f5c2038b4bbebe46b583e11ffad3da3..a550bbbb90dc35d2bae44a726c83fb50712e5cf3 100644
--- a/net/quic/congestion_control/tcp_cubic_sender_base.h
+++ b/net/quic/congestion_control/tcp_cubic_sender_base.h
@@ -143,6 +143,9 @@ class NET_EXPORT_PRIVATE TcpCubicSenderBase : public SendAlgorithmInterface {
   // When true, exit slow start with large cutback of congestion window.
   bool slow_start_large_reduction_;
 
+  // When true, use unity pacing instead of PRR.
+  bool no_prr_;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(TcpCubicSenderBase);
 };