Audio codec implementations: Take optional codec ID argument

None of the built-in codecs do anything with the ID, but callers will
soon require them to accept it.

Bug: webrtc:8941
Change-Id: I0eb77db82d72c7d34cff639fecb67c1e6ec421bf
Reviewed-on: https://webrtc-review.googlesource.com/58089
Commit-Queue: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Oskar Sundbom <ossu@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22259}

api/audio_codecs/builtin_audio_decoder_factory.cc

diff --git a/api/audio_codecs/builtin_audio_decoder_factory.cc b/api/audio_codecs/builtin_audio_decoder_factory.cc
index 9520d2a..c3e5d50 100644
--- a/api/audio_codecs/builtin_audio_decoder_factory.cc
+++ b/api/audio_codecs/builtin_audio_decoder_factory.cc
@@ -39,8 +39,10 @@
   static void AppendSupportedDecoders(std::vector<AudioCodecSpec>* specs) {
     // Don't advertise support for anything.
   }
-  static std::unique_ptr<AudioDecoder> MakeAudioDecoder(const Config& config) {
-    return T::MakeAudioDecoder(config);
+  static std::unique_ptr<AudioDecoder> MakeAudioDecoder(
+      const Config& config,
+      rtc::Optional<AudioCodecPairId> codec_pair_id = rtc::nullopt) {
+    return T::MakeAudioDecoder(config, codec_pair_id);
   }
 };