Cast: cancel re-sending if a later nack packet says the receiver doesn't want it anymore

media/cast/rtcp/rtcp_sender_unittest.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 "base/memory/scoped_ptr.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "media/cast/cast_defines.h"
 #include "media/cast/cast_environment.h"
 #include "media/cast/rtcp/receiver_rtcp_event_subscriber.h"
 #include "media/cast/rtcp/rtcp_sender.h"
@@ skipping 45 matching lines @@
 
   virtual bool SendPackets(
       const transport::SendPacketVector& packets) OVERRIDE {
     return false;
   }
   virtual bool ResendPackets(
       const transport::SendPacketVector& packets) OVERRIDE {
     return false;
   }
 
+  virtual void CancelSendingPacket(
+      const transport::PacketKey& packet_key) OVERRIDE {
+  }
+
   void SetExpectedRtcpPacket(scoped_ptr<Packet> packet) {
     expected_packet_.swap(*packet);
   }
 
   int packet_count() const { return packet_count_; }
 
  private:
   Packet expected_packet_;
   int packet_count_;
 
@@ skipping 466 matching lines @@
     testing_clock.Advance(
         base::TimeDelta::FromMilliseconds(kTimeBetweenEventsMs));
     time_base_ms += kTimeBetweenEventsMs;
   }
 
   EXPECT_EQ(static_cast<int>(packet_count), test_transport_.packet_count());
 }
 
 }  // namespace cast
 }  // namespace media