Adding support for RTCRtpEncodingParameters.active flag.

webrtc/api/rtpparameters.h

 /*
  *  Copyright 2015 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.
  */
 
 #ifndef WEBRTC_API_RTPPARAMETERS_H_
 #define WEBRTC_API_RTPPARAMETERS_H_
 
 #include <vector>
 
 namespace webrtc {
 
 // These structures are defined as part of the RtpSender interface.
 // See http://w3c.github.io/webrtc-pc/#rtcrtpsender-interface for details.
 struct RtpEncodingParameters {
+  bool active = true;
   int max_bitrate_bps = -1;
 };
 
 struct RtpParameters {
   std::vector<RtpEncodingParameters> encodings;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_RTPPARAMETERS_H_