Implement operator<< for AudioCodecInfo and AudioCodecSpec

webrtc/api/audio_codecs/audio_format.h

Index: webrtc/api/audio_codecs/audio_format.h
diff --git a/webrtc/api/audio_codecs/audio_format.h b/webrtc/api/audio_codecs/audio_format.h
index d8e33426b67c5551852c5c429ae45c676cda2f10..e8e5774e753a0edb903557c70115e965a97779d7 100644
--- a/webrtc/api/audio_codecs/audio_format.h
+++ b/webrtc/api/audio_codecs/audio_format.h
@@ -120,6 +120,8 @@ struct AudioCodecInfo {
                                            // network conditions.
 };
 
+std::ostream& operator<<(std::ostream& os, const AudioCodecInfo& aci);
+
 // AudioCodecSpec ties an audio format to specific information about the codec
 // and its implementation.
 struct AudioCodecSpec {
@@ -133,6 +135,8 @@ struct AudioCodecSpec {
   AudioCodecInfo info;
 };
 
+std::ostream& operator<<(std::ostream& os, const AudioCodecSpec& acs);
+
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_AUDIO_CODECS_AUDIO_FORMAT_H_