Fixes two div by zero bugs in QUIC's BBR pacing code that caused server

net/quic/quic_sent_packet_manager_test.cc

 // Copyright 2013 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_sent_packet_manager.h"
 
 #include "base/stl_util.h"
 #include "net/quic/quic_flags.h"
 #include "net/quic/test_tools/quic_config_peer.h"
 #include "net/quic/test_tools/quic_sent_packet_manager_peer.h"
@@ skipping 1018 matching lines @@
   manager_.OnIncomingAck(ack_frame, clock_.ApproximateNow());
   VerifyUnackedPackets(nullptr, 0);
   VerifyRetransmittablePackets(nullptr, 0);
 }
 
 TEST_F(QuicSentPacketManagerTest, ResetRecentMinRTTWithEmptyWindow) {
   QuicTime::Delta min_rtt = QuicTime::Delta::FromMilliseconds(50);
   QuicSentPacketManagerPeer::GetRttStats(&manager_)->UpdateRtt(
       min_rtt, QuicTime::Delta::Zero(), QuicTime::Zero());
   EXPECT_EQ(min_rtt,
-            QuicSentPacketManagerPeer::GetRttStats(&manager_)->min_rtt());
+            QuicSentPacketManagerPeer::GetRttStats(&manager_)->MinRtt());
   EXPECT_EQ(min_rtt,
             QuicSentPacketManagerPeer::GetRttStats(
                 &manager_)->recent_min_rtt());
 
   // Send two packets with no prior bytes in flight.
   SendDataPacket(1);
   SendDataPacket(2);
 
   clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(100));
   // Ack two packets with 100ms RTT observations.
   QuicAckFrame ack_frame;
   ack_frame.delta_time_largest_observed = QuicTime::Delta::Zero();
   ack_frame.largest_observed = 1;
   ExpectAck(1);
   manager_.OnIncomingAck(ack_frame, clock_.Now());
 
   // First ack does not change recent min rtt.
   EXPECT_EQ(min_rtt,
             QuicSentPacketManagerPeer::GetRttStats(
                 &manager_)->recent_min_rtt());
 
   ack_frame.largest_observed = 2;
   ExpectAck(2);
   manager_.OnIncomingAck(ack_frame, clock_.Now());
 
   EXPECT_EQ(min_rtt,
-            QuicSentPacketManagerPeer::GetRttStats(&manager_)->min_rtt());
+            QuicSentPacketManagerPeer::GetRttStats(&manager_)->MinRtt());
   EXPECT_EQ(QuicTime::Delta::FromMilliseconds(100),
             QuicSentPacketManagerPeer::GetRttStats(
                 &manager_)->recent_min_rtt());
 }
 
 TEST_F(QuicSentPacketManagerTest, RetransmissionTimeout) {
   // Send 100 packets and then ensure all are abandoned when the RTO fires.
   const size_t kNumSentPackets = 100;
   for (size_t i = 1; i <= kNumSentPackets; ++i) {
     SendDataPacket(i);
@@ skipping 304 matching lines @@
       .WillOnce(Return(100 * kDefaultTCPMSS));
   manager_.SetFromConfig(config);
 
   EXPECT_EQ(initial_rtt_us,
             manager_.GetRttStats()->SmoothedRtt().ToMicroseconds());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net