Adds dynamic setting of FEC group size based on the connection's current

net/quic/quic_connection_test.cc

 // 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.
 
 #include "net/quic/quic_connection.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/stl_util.h"
 #include "net/base/net_errors.h"
@@ skipping 3927 matching lines @@
   ack_header.fec_group = 1;
 
   QuicPacket* packet =
       BuildUnsizedDataPacket(&framer_, ack_header, frames).packet;
 
   // Take the packet which contains the ACK frame, and construct and deliver an
   // FEC packet which allows the ACK packet to be recovered.
   ProcessFecPacket(2, 1, true, !kEntropyFlag, packet);
 }
 
+TEST_P(QuicConnectionTest, NetworkChangeVisitorCallbacksChangeFecState) {
+  QuicPacketCreator* creator =
+      QuicConnectionPeer::GetPacketCreator(&connection_);
+  size_t max_packets_per_fec_group = creator->max_packets_per_fec_group();
+
+  QuicSentPacketManager::NetworkChangeVisitor* visitor =
+      QuicSentPacketManagerPeer::GetNetworkChangeVisitor(
+          QuicConnectionPeer::GetSentPacketManager(&connection_));
+  EXPECT_TRUE(visitor);
+
+  // Increase FEC group size by increasing congestion window to a large number.
+  visitor->OnCongestionWindowChange(1000 * kDefaultTCPMSS);
+  EXPECT_LT(max_packets_per_fec_group, creator->max_packets_per_fec_group());
+}
+
 class MockQuicConnectionDebugVisitor
     : public QuicConnectionDebugVisitor {
  public:
   MOCK_METHOD1(OnFrameAddedToPacket,
                void(const QuicFrame&));
 
   MOCK_METHOD5(OnPacketSent,
                void(QuicPacketSequenceNumber,
                     EncryptionLevel,
                     TransmissionType,
@@ skipping 83 matching lines @@
   QuicBlockedFrame blocked;
   blocked.stream_id = 3;
   EXPECT_CALL(visitor_, OnBlockedFrames(_));
   ProcessFramePacket(QuicFrame(&blocked));
   EXPECT_TRUE(ack_alarm->IsSet());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net