Use different RTX payload types for different H264 profiles

webrtc/media/base/mediaconstants.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 99 matching lines @@
 
 const int kDefaultVp8PlType = 100;
 const int kDefaultVp9PlType = 101;
 const int kDefaultH264PlType = 107;
 const int kDefaultRedPlType = 116;
 const int kDefaultUlpfecType = 117;
 const int kDefaultFlexfecPlType = 118;
 const int kDefaultRtxVp8PlType = 96;
 const int kDefaultRtxVp9PlType = 97;
 const int kDefaultRtxRedPlType = 98;
-const int kDefaultRtxH264PlType = 99;
+const int kDefaultRtxH264ConstrainedBaselinePlType = 99;
+const int kDefaultRtxH264ConstrainedHighPlType = 102;
 
 const int kDefaultVideoMaxFramerate = 60;
 }  // namespace cricket