Set the preferred DSCP value for Rtp data channel to be DSCP_AF41.

webrtc/media/base/rtpdataengine_unittest.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 52 matching lines @@
   cricket::RtpDataEngine* CreateEngine() {
     cricket::RtpDataEngine* dme = new cricket::RtpDataEngine();
     return dme;
   }
 
   cricket::RtpDataMediaChannel* CreateChannel() {
     return CreateChannel(dme_.get());
   }
 
   cricket::RtpDataMediaChannel* CreateChannel(cricket::RtpDataEngine* dme) {
+    cricket::MediaConfig config;
     cricket::RtpDataMediaChannel* channel =
-        static_cast<cricket::RtpDataMediaChannel*>(dme->CreateChannel(
-            cricket::DCT_RTP));
+        static_cast<cricket::RtpDataMediaChannel*>(
+            dme->CreateChannel(cricket::DCT_RTP, config));
     channel->SetInterface(iface_.get());
     channel->SignalDataReceived.connect(
         receiver_.get(), &FakeDataReceiver::OnDataReceived);
     return channel;
   }
 
   FakeDataReceiver* receiver() {
     return receiver_.get();
   }
 
@@ skipping 282 matching lines @@
     0x80, 0x65, 0x00, 0x02
   };
   rtc::CopyOnWriteBuffer packet(data, sizeof(data));
 
   std::unique_ptr<cricket::RtpDataMediaChannel> dmc(CreateChannel());
 
   // Too short
   dmc->OnPacketReceived(&packet, rtc::PacketTime());
   EXPECT_FALSE(HasReceivedData());
 }