Set actual transport overhead in rtp_rtcp

webrtc/pc/channel_unittest.cc

Index: webrtc/pc/channel_unittest.cc
diff --git a/webrtc/pc/channel_unittest.cc b/webrtc/pc/channel_unittest.cc
index 00382fab8e44582a561a80a44fa66eaa96a53384..46e8b1f2ead8d94d16ef6c90be8aa9218270832c 100644
--- a/webrtc/pc/channel_unittest.cc
+++ b/webrtc/pc/channel_unittest.cc
@@ -958,11 +958,16 @@ class ChannelTest : public testing::Test, public sigslot::has_slots<> {
     });
     WaitForThreads();
     EXPECT_EQ(1, media_channel1->num_network_route_changes());
+    constexpr int kTransportOverheadPerPacket = 28;  // Ipv4(20) + UDP(8).
     rtc::NetworkRoute expected_network_route(true, kLocalNetId, kRemoteNetId,
-                                             kLastPacketId);
+                                             kLastPacketId,
+                                             kTransportOverheadPerPacket);
     EXPECT_EQ(expected_network_route, media_channel1->last_network_route());
     EXPECT_EQ(kLastPacketId,
               media_channel1->last_network_route().last_sent_packet_id);
+    EXPECT_EQ(
+        kTransportOverheadPerPacket,
+        media_channel1->last_network_route().transport_overhead_per_packet);
   }
 
   // Test setting up a call.