Pass SdpAudioFormat through Channel, without converting to CodecInst

webrtc/modules/audio_coding/acm2/audio_coding_module_unittest.cc

 /*
  *  Copyright (c) 2014 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 1023 matching lines @@
               Invoke(&pcmu_decoder_, &AudioDecoderPcmU::HasDecodePlc));
       EXPECT_CALL(*mock_decoder_, PacketDuration(_, _))
           .Times(AtLeast(1))
           .WillRepeatedly(
               Invoke(&pcmu_decoder_, &AudioDecoderPcmU::PacketDuration));
       EXPECT_CALL(*mock_decoder_, Die());
     }
     std::vector<AudioCodecSpec> GetSupportedDecoders() override {
       return fact_->GetSupportedDecoders();
     }
+    bool IsSupportedDecoder(const SdpAudioFormat& format) override {
+      return format.name == "MockPCMu" ? true
+                                       : fact_->IsSupportedDecoder(format);
+    }
     std::unique_ptr<AudioDecoder> MakeAudioDecoder(
         const SdpAudioFormat& format) override {
       return format.name == "MockPCMu" ? std::move(mock_decoder_)
                                        : fact_->MakeAudioDecoder(format);
     }
 
    private:
     // Class intended to forward a call from a mock DecodeInternal to Decode on
     // the real decoder's Decode. DecodeInternal for the real decoder isn't
     // public.
@@ skipping 781 matching lines @@
   Run(16000, 8000, 1000);
 }
 
 TEST_F(AcmSwitchingOutputFrequencyOldApi, Toggle8KhzTo16Khz) {
   Run(8000, 16000, 1000);
 }
 
 #endif
 
 }  // namespace webrtc