RtpRtcp allows to register header extension by name

webrtc/modules/rtp_rtcp/mocks/mock_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.
  */
 
 #ifndef WEBRTC_MODULES_RTP_RTCP_MOCKS_MOCK_RTP_RTCP_H_
 #define WEBRTC_MODULES_RTP_RTCP_MOCKS_MOCK_RTP_RTCP_H_
 
 #include <set>
+#include <string>
 #include <utility>
 #include <vector>
 
 #include "testing/gmock/include/gmock/gmock.h"
 
 #include "webrtc/modules/include/module.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_rtcp.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/transport_feedback.h"
 
@@ skipping 46 matching lines @@
   MOCK_CONST_METHOD0(MaxDataPayloadLength,
       uint16_t());
   MOCK_METHOD1(RegisterSendPayload,
       int32_t(const CodecInst& voiceCodec));
   MOCK_METHOD1(RegisterSendPayload,
       int32_t(const VideoCodec& videoCodec));
   MOCK_METHOD1(DeRegisterSendPayload,
       int32_t(const int8_t payloadType));
   MOCK_METHOD2(RegisterSendRtpHeaderExtension,
       int32_t(const RTPExtensionType type, const uint8_t id));
+  MOCK_METHOD2(RegisterRtpHeaderExtension,
+               bool(const std::string& type, uint8_t id));
   MOCK_METHOD1(DeregisterSendRtpHeaderExtension,
       int32_t(const RTPExtensionType type));
   MOCK_CONST_METHOD0(StartTimestamp,
       uint32_t());
   MOCK_METHOD1(SetStartTimestamp, void(const uint32_t timestamp));
   MOCK_CONST_METHOD0(SequenceNumber,
       uint16_t());
   MOCK_METHOD1(SetSequenceNumber, void(const uint16_t seq));
   MOCK_METHOD2(SetRtpStateForSsrc,
                bool(uint32_t ssrc, const RtpState& rtp_state));
@@ skipping 167 matching lines @@
       void(StreamDataCountersCallback*));
   MOCK_CONST_METHOD0(GetSendChannelRtpStatisticsCallback,
       StreamDataCountersCallback*(void));
   // Members.
   unsigned int remote_ssrc_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_MOCKS_MOCK_RTP_RTCP_H_