Create QUIC_VERSION_16 which breaks the sent_info field out of the ACK

net/quic/quic_packet_generator.h

Index: net/quic/quic_packet_generator.h
diff --git a/net/quic/quic_packet_generator.h b/net/quic/quic_packet_generator.h
index 1ff04882ae11380f0e1d4aa46e0e2d712a79e4ad..1434451fb6d4648f25ed0357a1fd642928e21d31 100644
--- a/net/quic/quic_packet_generator.h
+++ b/net/quic/quic_packet_generator.h
@@ -69,6 +69,7 @@ class NET_EXPORT_PRIVATE QuicPacketGenerator {
                                       IsHandshake handshake) = 0;
     virtual QuicAckFrame* CreateAckFrame() = 0;
     virtual QuicCongestionFeedbackFrame* CreateFeedbackFrame() = 0;
+    virtual QuicStopWaitingFrame* CreateStopWaitingFrame() = 0;
     // Takes ownership of |packet.packet| and |packet.retransmittable_frames|.
     virtual bool OnSerializedPacket(const SerializedPacket& packet) = 0;
     virtual void CloseConnection(QuicErrorCode error, bool from_peer) = 0;
@@ -93,9 +94,16 @@ class NET_EXPORT_PRIVATE QuicPacketGenerator {
 
   // Indicates that an ACK frame should be sent.  If |also_send_feedback| is
   // true, then it also indicates a CONGESTION_FEEDBACK frame should be sent.
+  // If |also_send_stop_waiting| is true, then it also indicates that a
+  // STOP_WAITING frame should be sent as well.
   // The contents of the frame(s) will be generated via a call to the delegates
   // CreateAckFrame() and CreateFeedbackFrame() when the packet is serialized.
-  void SetShouldSendAck(bool also_send_feedback);
+  void SetShouldSendAck(bool also_send_feedback,
+                        bool also_send_stop_waiting);
+
+  // Indicates that a STOP_WAITING frame should be sent.
+  void SetShouldSendStopWaiting();
+
   void AddControlFrame(const QuicFrame& frame);
 
   // Given some data, may consume part or all of it and pass it to the
@@ -155,12 +163,14 @@ class NET_EXPORT_PRIVATE QuicPacketGenerator {
   // Flags to indicate the need for just-in-time construction of a frame.
   bool should_send_ack_;
   bool should_send_feedback_;
+  bool should_send_stop_waiting_;
   // If we put a non-retransmittable frame (namley ack or feedback frame) in
   // this packet, then we have to hold a reference to it until we flush (and
   // serialize it). Retransmittable frames are referenced elsewhere so that they
   // can later be (optionally) retransmitted.
   scoped_ptr<QuicAckFrame> pending_ack_frame_;
   scoped_ptr<QuicCongestionFeedbackFrame> pending_feedback_frame_;
+  scoped_ptr<QuicStopWaitingFrame> pending_stop_waiting_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicPacketGenerator);
 };