Enable audio streams to send padding.

webrtc/modules/rtp_rtcp/include/rtp_rtcp.h

 /*
  *  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 137 matching lines @@
   // Returns -1 on failure else 0.
   virtual int32_t DeRegisterSendPayload(int8_t payload_type) = 0;
 
   // (De)registers RTP header extension type and id.
   // Returns -1 on failure else 0.
   virtual int32_t RegisterSendRtpHeaderExtension(RTPExtensionType type,
                                                  uint8_t id) = 0;
 
   virtual int32_t DeregisterSendRtpHeaderExtension(RTPExtensionType type) = 0;
 
+  virtual bool HasBweExtensions() const = 0;
+
   // Returns start timestamp.
   virtual uint32_t StartTimestamp() const = 0;
 
   // Sets start timestamp. Start timestamp is set to a random value if this
   // function is never called.
   virtual void SetStartTimestamp(uint32_t timestamp) = 0;
 
   // Returns SequenceNumber.
   virtual uint16_t SequenceNumber() const = 0;
 
@@ skipping 302 matching lines @@
   virtual int32_t SetKeyFrameRequestMethod(KeyFrameRequestMethod method) = 0;
 
   // Sends a request for a keyframe.
   // Returns -1 on failure else 0.
   virtual int32_t RequestKeyFrame() = 0;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_INCLUDE_RTP_RTCP_H_