Revert "Remove CodecInst pt.1"

This reverts commit 056f9738bf7a3d16da45398239656e165c4e0851.

Reason for revert: breaks downstream

Original change's description:
> Remove CodecInst pt.1
> 
> Update audio_coding tests to not use CodecInst.
> 
> Bug: webrtc:7626
> Change-Id: I880fb8d72d7d0a915d274e67feb6106f023697c2
> Reviewed-on: https://webrtc-review.googlesource.com/c/112594
> Commit-Queue: Fredrik Solenberg <solenberg@webrtc.org>
> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#25879}

TBR=solenberg@webrtc.org,kwiberg@webrtc.org

Change-Id: I51d666969bcd63e2b7cb7d669ec2f59b5f8f9dde
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:7626
Reviewed-on: https://webrtc-review.googlesource.com/c/112906
Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
Commit-Queue: Fredrik Solenberg <solenberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25881}
diff --git a/modules/audio_coding/test/TestAllCodecs.h b/modules/audio_coding/test/TestAllCodecs.h
index 3125efe..669a118 100644
--- a/modules/audio_coding/test/TestAllCodecs.h
+++ b/modules/audio_coding/test/TestAllCodecs.h
@@ -13,7 +13,7 @@
 
 #include <memory>
 
-#include "modules/audio_coding/include/audio_coding_module.h"
+#include "modules/audio_coding/test/Channel.h"
 #include "modules/audio_coding/test/PCMFile.h"
 
 namespace webrtc {
@@ -48,7 +48,7 @@
 
 class TestAllCodecs {
  public:
-  TestAllCodecs();
+  explicit TestAllCodecs(int test_mode);
   ~TestAllCodecs();
 
   void Perform();
@@ -67,7 +67,9 @@
 
   void Run(TestPack* channel);
   void OpenOutFile(int test_number);
+  void DisplaySendReceiveCodec();
 
+  int test_mode_;
   std::unique_ptr<AudioCodingModule> acm_a_;
   std::unique_ptr<AudioCodingModule> acm_b_;
   TestPack* channel_a_to_b_;