Attach QuicAckNotifiers to the serialized packet, instead of individual

net/quic/quic_packet_generator.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Responsible for generating packets on behalf of a QuicConnection.
 // Packets are serialized just-in-time.  Control frames are queued.
 // Ack and Feedback frames will be requested from the Connection
 // just-in-time.  When a packet needs to be sent, the Generator
 // will serialize a packet and pass it to QuicConnection::SendOrQueuePacket()
 //
@@ skipping 35 matching lines @@
 // mode, we should probably set a timer so that several independent
 // operations can be grouped into the same FEC group.
 //
 // When an FEC packet is generated, it will be send to the Delegate,
 // even if the Delegate has become unwritable after handling the
 // data packet immediately proceeding the FEC packet.
 
 #ifndef NET_QUIC_QUIC_PACKET_GENERATOR_H_
 #define NET_QUIC_QUIC_PACKET_GENERATOR_H_
 
+#include "base/containers/hash_tables.h"
 #include "net/quic/quic_ack_notifier.h"
 #include "net/quic/quic_packet_creator.h"
 #include "net/quic/quic_sent_packet_manager.h"
 #include "net/quic/quic_types.h"
 
 namespace net {
 
 namespace test {
 class QuicPacketGeneratorPeer;
 }  // namespace test
@@ skipping 174 matching lines @@
   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_;
 
+  // Stores notifiers that should be attached to the next serialized packet.
+  base::hash_set<QuicAckNotifier*> ack_notifiers_;
+
   DISALLOW_COPY_AND_ASSIGN(QuicPacketGenerator);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_PACKET_GENERATOR_H_