Refactor to create a new LossDetectionInterface used by the

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/test_tools/quic_sent_packet_manager_peer.h"
 #include "net/quic/test_tools/quic_test_utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 17 matching lines @@
     // Disable tail loss probes for most tests.
     QuicSentPacketManagerPeer::SetMaxTailLossProbes(&manager_, 0);
     // Advance the time 1s so the send times are never QuicTime::Zero.
     clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(1000));
   }
 
   virtual ~QuicSentPacketManagerTest() {
     STLDeleteElements(&packets_);
   }
 
+  virtual void SetUp() {
+    // Ack handling requests a smoothed rtt for loss detection.
+    EXPECT_CALL(*send_algorithm_, SmoothedRtt())
+        .WillRepeatedly(Return(QuicTime::Delta::FromMilliseconds(1)));
+  }
+
   void VerifyUnackedPackets(QuicPacketSequenceNumber* packets,
                             size_t num_packets) {
     if (num_packets == 0) {
       EXPECT_FALSE(manager_.HasUnackedPackets());
       EXPECT_EQ(0u, QuicSentPacketManagerPeer::GetNumRetransmittablePackets(
           &manager_));
       return;
     }
 
     EXPECT_TRUE(manager_.HasUnackedPackets());
@@ skipping 1224 matching lines @@
     delay = delay.Add(delay);
     EXPECT_CALL(*send_algorithm_, OnRetransmissionTimeout(true));
     manager_.OnRetransmissionTimeout();
     RetransmitNextPacket(i + 2);
   }
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net