Changes QUIC's SentPacketManager to pass in HAS_RETRANSMITTABLE_DATA to

net/quic/quic_sent_packet_manager.h

Index: net/quic/quic_sent_packet_manager.h
diff --git a/net/quic/quic_sent_packet_manager.h b/net/quic/quic_sent_packet_manager.h
index 2a3ea64fb7d8184bde67a00c093dcc4fdd7c30d0..42b3706a360b04a62629b45023587092ce7dee4d 100644
--- a/net/quic/quic_sent_packet_manager.h
+++ b/net/quic/quic_sent_packet_manager.h
@@ -111,6 +111,13 @@ class NET_EXPORT_PRIVATE QuicSentPacketManager {
   bool IsUnacked(QuicPacketSequenceNumber sequence_number) const;
 
   // Requests retransmission of all unacked packets of |retransmission_type|.
+  // The behavior of this method depends on the value of |retransmission_type|:
+  // ALL_UNACKED_RETRANSMISSION - All unacked packets will be retransmitted.
+  // This can happen, for example, after a version negotiation packet has been
+  // received and all packets needs to be retransmitted with the new version.
+  // ALL_INITIAL_RETRANSMISSION - Only initially encrypted packets will be
+  // retransmitted. This can happen, for example, when a CHLO has been rejected
+  // and the previously encrypted data needs to be encrypted with a new key.
   void RetransmitUnackedPackets(TransmissionType retransmission_type);
 
   // Retransmits the oldest pending packet there is still a tail loss probe