Part of QUIC v39 change: 1) do not ack acks. 2) Send a WINDOW_UPDATE frame every 20 packets which d…

net/quic/core/quic_packet_generator.h

Index: net/quic/core/quic_packet_generator.h
diff --git a/net/quic/core/quic_packet_generator.h b/net/quic/core/quic_packet_generator.h
index bd4604c58c3f37d62fb764d2035152cdc88b8be8..43bffc1f4a4b8e786b12549ce2fc286fe8d65a2b 100644
--- a/net/quic/core/quic_packet_generator.h
+++ b/net/quic/core/quic_packet_generator.h
@@ -162,6 +162,10 @@ class QUIC_EXPORT_PRIVATE QuicPacketGenerator {
   // Sets the encrypter to use for the encryption level.
   void SetEncrypter(EncryptionLevel level, QuicEncrypter* encrypter);
 
+  // Returns true if there are control frames or current constructed packet has
+  // pending retransmittable frames.
+  bool HasRetransmittableFrames() const;
+
   // Sets the encryption level that will be applied to new packets.
   void set_encryption_level(EncryptionLevel level);