Discard acks from QUIC's UnackedPacketMap when the map is larger than

net/quic/quic_unacked_packet_map_test.cc

 // Copyright 2014 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_unacked_packet_map.h"
 
 #include "net/quic/test_tools/quic_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using std::min;
@@ skipping 108 matching lines @@
   VerifyRetransmittablePackets(nullptr, 0);
 
   unacked_packets_.IncreaseLargestObserved(1);
   VerifyUnackedPackets(nullptr, 0);
   VerifyInFlightPackets(nullptr, 0);
   VerifyRetransmittablePackets(nullptr, 0);
 }
 
 TEST_F(QuicUnackedPacketMapTest, DiscardOldRttOnly) {
   // Acks are only tracked for RTT measurement purposes, and are discarded
-  // when more than 200 accumulate.
-  const size_t kNumUnackedPackets = 200;
-  for (size_t i = 1; i < 400; ++i) {
+  // when more than 2500 accumulate.
+  const size_t kNumUnackedPackets = 2500;
+  for (size_t i = 1; i < 3000; ++i) {
     unacked_packets_.AddSentPacket(CreateNonRetransmittablePacket(i), 0,
                                    NOT_RETRANSMISSION, now_, kDefaultAckLength,
                                    false);
     unacked_packets_.RemoveObsoletePackets();
     EXPECT_EQ(min(i, kNumUnackedPackets),
               unacked_packets_.GetNumUnackedPacketsDebugOnly());
   }
 }
 
 TEST_F(QuicUnackedPacketMapTest, RetransmittableInflightAndRtt) {
@@ skipping 225 matching lines @@
   EXPECT_TRUE(unacked_packets_.IsUnacked(3));
   EXPECT_FALSE(unacked_packets_.IsUnacked(4));
   EXPECT_TRUE(unacked_packets_.IsUnacked(5));
   EXPECT_EQ(5u, unacked_packets_.largest_sent_packet());
 }
 
 
 }  // namespace
 }  // namespace test
 }  // namespace net