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

webrtc/media/base/fakemediaengine.h

 /*
  *  Copyright (c) 2004 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 925 matching lines @@
 inline FakeVideoMediaChannel::~FakeVideoMediaChannel() {
   if (engine_) {
     engine_->UnregisterChannel(this);
   }
 }
 
 class FakeDataEngine : public DataEngineInterface {
  public:
   FakeDataEngine() : last_channel_type_(DCT_NONE) {}
 
-  virtual DataMediaChannel* CreateChannel(DataChannelType data_channel_type) {
+  virtual DataMediaChannel* CreateChannel(DataChannelType data_channel_type,
+                                          const MediaConfig& config) {
     last_channel_type_ = data_channel_type;
     FakeDataMediaChannel* ch = new FakeDataMediaChannel(this, DataOptions());
     channels_.push_back(ch);
     return ch;
   }
 
   FakeDataMediaChannel* GetChannel(size_t index) {
     return (channels_.size() > index) ? channels_[index] : NULL;
   }
 
@@ skipping 11 matching lines @@
 
  private:
   std::vector<FakeDataMediaChannel*> channels_;
   std::vector<DataCodec> data_codecs_;
   DataChannelType last_channel_type_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_BASE_FAKEMEDIAENGINE_H_